Answer:
Understanding Populations
Section 1 How Populations Change in Size
Objectives
Describe the three main properties of a population.
Describe exponential population growth.
Describe how the reproductive behavior of individuals can affect the growth rate of their population.
Explain how population sizes in nature are regulated.
What Is a Population?
A population is a group of organisms of the same species that live in a specific geographical area and interbreed. A population is a reproductive group because organisms usually breed with members of their own population.
Properties of Populations
Density is the number of individuals of the same species that live in a given unit of area. Dispersion is the pattern of distribution of organisms in a population. A population’s dispersion may be even, clumped, or random. Size, density, dispersion, and other properties can be used to describe populations and to predict changes within them.
How Does a Population Grow?
A population gains individuals with each new offspring or birth and loses them with each death. The resulting population change over time can be represented by the equation below.
Growth rate is an expression of the increase in the size of an organism or population over a given period of time. It is the birth rate minus the death rate. Overtime, the growth rates of populations change because birth rates and death rates increase or decrease. For this reason, growth rates can be positive, negative, or zero.
For the growth rate to be zero, the average number of births must equal the average number of deaths. If the adults in a population are not replaced by new births, the growth rate will be negative and the population will shrink.Explanation:
Nature's population sizes are restrained through density-dependent factors like predation and competition, and density-independent factors such as weather, with humans impacting these through agriculture, medical advances, and urbanization. Models like exponential and logistic growth help predict population dynamics but simplify the complexity of real-life scenarios where factors change over time.
Explanation:Population sizes in nature are regulated by density-dependent and density-independent factors. Density-dependent factors include competition, predation, disease, and parasitism, which become more significant as the population density increases. Conversely, density-independent factors such as natural disasters, severe weather, and human activities like pollution affect populations regardless of their size.
Humans overcome density-dependent regulation through techniques like agriculture, which increases food supply, medical advancements that reduce death from diseases, and urbanization that provides living space. However, these interventions can lead to overpopulation and environmental degradation.
Population ecologists use models like the exponential growth and logistic growth models to predict population dynamics; the latter incorporates carrying capacity, which is the maximum population size that the environment can sustain over time. While useful, these models are simplifications of complex real-life population dynamics where carrying capacity and other factors can fluctuate significantly with time and conditions.
The role of photosynthesis in the cycling of matter and flow of energy into and out of organisms
Photosynthesis in plants is a vital process that converts light energy into glucose and produces oxygen. It facilitates the cycling of matter and energy flow in organisms.
Explanation:Photosynthesis is the process by which green plants, algae, and some bacteria convert sunlight, carbon dioxide, and water into glucose (a form of energy) and oxygen. It plays a crucial role in the cycling of matter and energy flow in organisms. During photosynthesis, plants take in carbon dioxide from the atmosphere and release oxygen, which is used by animals for respiration. Additionally, glucose produced during photosynthesis serves as a source of energy for plants and is passed on to other organisms when they consume plant material.
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When did Cyanobacteria start producing pure oxygen
Answer:
After the hadeon
Explanation:
The Cyanobacteria start producing pure oxygen after the Hadean eon. The correct option is B.
What is Cyanobacteria?Cyanobacteria, also known as Cyanophyta, are a phylum of microscopic organisms and plastids that obtain their energy from photosynthesis.
They are the primary photosynthetic prokaryotes capable of delivering oxygen.
The name cyanobacteria refers to the color of the microorganisms. After the Hadean eon, cyanobacteria began producing pure oxygen.
Toxins produced by cyanobacteria can affect various parts of the body. Different cyanobacteria species can produce toxins that harm the liver, affect the central nervous system (neurotoxins), and produce toxic alkaloids that harm the kidneys and gastrointestinal tract.
High levels of blue-green algae and their toxins can cause diarrhea, nausea, and vomiting, as well as skin, eye, and throat irritation, allergic reactions, and breathing difficulties.
Thus, the correct option is B.
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Your question seems incomplete, the missing options are:
A. During the Hadean eon
B. After the Hadean eon
C. During the Phanerozoic eon
D. After the Proterozoic eon
Observing the size of a herd of elephants that are all the same species would be an observation at the ___________ level.
Question 3 options:
community
ecosystem
population
individual
Answer:
population
Explanation:
Answer:
The correct answer is option "population".
Explanation:
In ecology, a population is defined as a group of organisms living in a particular area or region. An observation of a herd of elephants will be a study at the population level, since it is comprised of a limited number of individuals all belonging to the same species. A study of a community would involve observing different species and their interactions, while a study of an ecosystem would involve studying living and non living components over an extensive geographical region.
Describe how breathing is controlled
will give brainlist if right!
Leukocytes are found in lots of places, including an organ in your belly that filters
blood and helps fight infections known as the:
A. Heart
B. Spleen
C. Kidneys
D. Brain
Answer:
B. Spleen
Explanation:
The spleen is part of the lymphatic system. The lymphatic system helps to drain toxins and houses lymphocytes.
Plz Help Asap
Define and compare the relationship between the following principles. Provide a supporting example for each comparison.
Original Horizontality
Original Lateral Extension
Cross-Cutting Relationships
Inclusion
Uniformity.
This is Geology Btw
Original Horizontality- This principle stated by Nicholas Steno says that the gravitational pull deposits the sediment layers horizontally.
Original Lateral Extension- It states that a rock keeps on extending laterally unless a structural change prevents it.
Cross- cutting Relationships- This relationship states that if one geologic feature cuts another feature then it is younger of the two.
Inclusion- The inclusions observed in the sedimentary rocks if are in a formation then it concludes that the foundation is younger than the inclusion.
Uniformity- It states that all the geological processes are executed in a similar manner and a same intensity can be found in the past and in the present. This uniformity in the geological processes is enough for all the changes in geology.
The first two principles conclude that Earth was in the continuous process of formation and it still is because the deposit of layers and their constant extension and movements are the reason.
The inclusion and cross cutting are related as they both states about the sediment rock formations and the how it decides the ages of rock through changes. Uniformity is the bond that controls all the principles.
Final answer:
The principles of Original Horizontality, Original Lateral Extension, Cross-Cutting Relationships, Inclusion, and Uniformity are all important concepts in geology. These principles help geologists interpret rock layers and geological events.
Explanation:
Original Horizontality, Original Lateral Extension, Cross-Cutting Relationships, Inclusion, and Uniformity are all principles used in the field of geology to interpret rock layers and geological events.
The principle of Original Horizontality states that sedimentary rocks are originally deposited in horizontal layers. For example, when a sedimentary rock layer is found tilted or folded, it can be inferred that these deformations occurred after the rock layer was deposited.
Original Lateral Extension is a principle that refers to the lateral extension of sedimentary layers. If sedimentary layers are observed to extend laterally and become thinner away from the source, it indicates that these layers were originally deposited in a continuous horizontal fashion. The principle of Original Horizontality is closely related to this principle.
Cross-Cutting Relationships involve the observation of geological features, such as faults or igneous intrusions, cutting across existing rock layers. According to this principle, if a geological feature cuts through a rock layer, it is younger than the rock layer it cuts through. For example, if a fault is observed to cut through sedimentary rocks, the fault is determined to be younger than the sedimentary rocks it intersects.
Inclusions are fragments of one rock unit that are enclosed within another rock unit. The principle of Inclusion states that the rock containing the inclusions is younger than the rock that contains the inclusions. For instance, if a conglomerate rock contains pebbles of another rock type, it can be concluded that the conglomerate is younger than the rock from which the pebbles were derived.
Uniformity, also known as the principle of Uniformitarianism, is the concept that the processes and natural laws that operated in the past are the same as those observed today. This principle allows geologists to interpret past geological events based on present-day observations and processes.
The formula for logistic growth rate is shown above. A population of salmon has a carrying capacity of 2500 in a small fishery.
What will occur when the population reaches 3000 for the salmon?
A)
The population will stabilize at 3000.
The population can never reach 3000 in this case.
The population will grow because the growth rate will be positive.
The population will decline because the growth rate will be negative.
Answer:
d
Explanation:
The population will decline because the growth rate will be negative. Therefore, option (D) is correct.
What is growth rate?Growth rates are used to calculate the yearly percentage change in a variable. A variable's growth rate may be positive or negative, indicating whether it is rising or decreasing with time. Growth rates may be useful in determining the current and future success of an organisation.
The greatest number of a biological species that can be supported by a particular environment, given the availability of food, habitat, water, and other resources, is known as the carrying capacity of that ecosystem.
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Which statement best explains how power is generated in a tidal power plant?
A. A barrage releases water as the tide comes in and goes out, turning the plant's turbines.
B. As the water flows through a barrage at high and low tides, it turns the plant's turbines.
C. A barrage holds water at high tide, when the water is released, it turns the plant's turbines.
D. A barrage holds water back when the tides change, the force of this turns the plant's turbines.
B
A barrage is a dam-like structure that is built in the tidal zone of an ocean to capture tidal energy.
Explanation:
It has sluice gates that can be controlled to harness the kinetic energy in the flow of water. The sluice gates also have turbines. During high tides, as the water flows into the barrage, it turns the turbines that generate electricity using the dynamo effect. During low tide, as the water recedes back to the oceans, and the barrage gets emptied, the water flow, again, turns the turbines.
Some barrages first capture the ocean water during high tide, until the dam-like structure is full, without generating electricity. When the tide is low, the sluice gates release the water and the turbines generate electricity. This kind is a one –way power generation.
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The correct statement that best explains how power is generated in a tidal power plant is (C). A barrage holds water at high tide, when the water is released, it turns the plant's turbines.
To understand why option C is the correct explanation, let's consider the process of power generation in a tidal power plant:
1. Tidal power plants are typically located in areas where there is a significant difference between high and low tides. This difference in water levels is essential for generating power.
2. A tidal barrage, which is a dam-like structure, is constructed across a tidal basin or estuary. The barrage includes a sluice gate that can be opened or closed to control the flow of water.
3. At high tide, the barrage gates are closed, trapping a large volume of water behind the barrage. This creates a height difference between the water levels on either side of the barrage.
4. As the tide begins to fall, the water level outside the barrage drops while the water level behind the barrage remains high due to the trapped water.
5. When there is sufficient height difference, the sluice gates are opened, allowing the trapped high-tide water to flow through the turbines installed in the barrage. The kinetic energy of the flowing water is used to turn the turbines.
6. The turbines are connected to generators, which convert the mechanical energy from the rotating turbines into electrical energy.
7. Once the water level behind the barrage has equalized with the outside water level, the gates can be closed again to start the process anew with the next high tide.
Option A is incorrect because it suggests that water is released both as the tide comes in and goes out, which is not how a typical tidal barrage operates. Option B is incorrect because it does not specify that the water is held back to create a height difference, which is crucial for generating power. Option D is incorrect because it vaguely refers to the force of the tides changing, which does not accurately describe the process of water being held back and then released to turn the turbines.
Define the different types of organism relationships and give examples of each
Answer:
Predator prey relationship
Explanation:
I can only think of this at the moment and it is simply between predator and prey. The predator consumes the prey and this relationship has an effect on the food chain/ food web.
A healthy way to gain weight would be to simply add more calories to your diet. Group of answer choices
Answer:
A healthy way to gain weight would be to simply add more calories to your diet is a TRUE statement.
Explanation:
The number of "calories" that an individual consumes and burns daily plays an important role in determining his/her weight. A person who consumes more calories than he burns daily could become overweight whereas if a person is consuming fewer calories than what he burns could cause him to lose weight.
The best way to gain weight is to "add more calories" to one's diet while also keeping in mind the number of calories being burnt daily. The newly added calories should sum up greater than the total calories burnt regularly.
Hence, the statement about adding calories in the diet to gain weight is true.
Answer:
True
Explanation:
What consists of proteins joined together to create fiber like structures inside the cell
Answer:
Cytoskeleton
Explanation:
The cytoskeleton is a structure that helps cells maintain their shape and internal organization, and it also provides mechanical support that enables cells to carry out essential functions like division and movement. Cytoskeleton is made of filamentous proteins, and it provides mechanical support to the cell and its cytoplasmic constituents. All cytoskeletons consist of three major classes of elements that differ in size and in protein composition including microtubules, actin filaments and intermediate filaments.
15. Which of the processes has more than one type of RNA involved?
Answer:
Translation
Explanation:
Translation is the process by which mRNA is decoded and translated to produce a polypeptide sequence, otherwise known as a protein. This method of synthesizing proteins is directed by the mRNA and accomplished with the help of a ribosome, a large complex of ribosomal RNAs (rRNAs) and proteins. In translation, a cell decodes the mRNA’s genetic message and assembles the brand-new polypeptide chain. Transfer RNA, or tRNA, translates the sequence of codons on the mRNA strand. The main function of tRNA is to transfer a free amino acid from the cytoplasm to a ribosome, where it is attached to the growing polypeptide chain. tRNAs continue to add amino acids to the growing end of the polypeptide chain until they reach a stop codon on the mRNA. The ribosome then releases the completed protein into the cell.
Nuclear power plants require a lot of water to operate.
true or false
The answer is true
Explanation:
Nuclear power plants require a lot of water to operate. This is because cooling water is needed in many processes of powering nuclear power plants such as the thermodynamic processes that enables the power plant to a stable temperature.
True, nuclear power plants require a lot of water, primarily for cooling purposes. Water absorbs the excess heat generated by the nuclear fission process in the reactor and transports it away, preventing overheating.
Explanation:True, nuclear power plants do require a lot of water to operate. The primary reason for this is for cooling purposes. The heat generated by the nuclear fission process in the reactor core needs to be cooled to prevent the reactor from overheating, which could result in a nuclear meltdown. The cooling process typically involves using a coolant, usually water, which absorbs the excess heat and transports it away from the reactor. This cooled water is usually released back into the natural environment, such as a river or the ocean, but some of it evaporates into the atmosphere.
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Which best describes how ocean currents are created?
O A. Heating differences between the poles and the equator because
of the sun lead to convection.
O B. Wind differences between the poles and the equator because of
the sun's light lead to ocean currents.
O
C. Earth's rotation disturbs ocean waters, leading to a system of
currents between the poles and equator.
Answer:A.
Explanation:
Just did it.
Ocean currents are created by the heating differences between the poles and equator due to solar heating, which leads to convection, and are also influenced by Earth's rotation causing the Coriolis effect.
A is correct
Explanation:The creation of ocean currents is best described by the process of heating differences between the poles and equator due to the sun, which leads to convection. This is because the flow of matter is driven by large-scale convection, where warm water rises and cold water sinks due to changes in density related to temperature changes.
Additionally, the Earth's rotation also plays a significant role by causing the Coriolis effect, which affects the patterns of flow in the oceans. Therefore, both the heating difference and Earth's rotational movement combine to create the system of ocean currents that transfer heat around the planet.
Word analysis. examine the words and/or phrases for each question below and determine the relationship among the majority of words /phrases. chooses the options that does not fit the pattern.
a.wave height
b.wave period
c.wave refraction
d.fetch
In this example, all of the words that are shown are connected in a certain way, except for the A option wave height.
What are wave height and wave period?Fetch is the defined area in which ocean waves are generated by the wind, it is also referred to as the length of a fetch area.
Wave refraction is the change in the direction of a wave as it passes from one material to another. Wave height is how long the wave is from trough to crest and wave period is the successive time from a point where the wave passes.
Wave duration is the amount of time it takes for successive waves to pass a fixed point, such as a buoy, while wave height normally refers to how tall a wave is from trough to crest.
Therefore, wave height from the options does not fit the pattern.
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paracrime signsling is different from other types of signaling in that the signaling molecule
Answer:
Paracrine signaling is different from other types of signaling in that the signaling molecule that is secreted from one cell binds to the receptor of the adjacent cell.
Explanation:
Paracrine signaling occur between two adjacent cells.During paracrine signaling the signaling molecule or ligand is released from one cell and the released signaling molecule binds the the surface receptor of the adjacent cell.
For example transmission of nerve impulse between two neurons through synapse.
Is mount rainier a top-down or bottom-up
natural philosophers have long pondered the underlying reasons for color in nature. One common historical belief was that colored objects in nature produced small particles that subsequently reaches our eyes. different objects produce different color particles thus contributing to their different appearance. is this belief accurate or not?
This belief is not accurate
Explanation:
The light wave of different frequencies or of a single frequency when reaches an object different occurrences take place. Such occurrences are- of light absorption, where an object absorbs the wavelength of light and the energy gets converted into heat; the light gets reflected by that object and it might be transmitted too.
An object looks colored because it absorbs the frequencies of a particular color and reflects it. It occurs because the material frequency of the object matches the light frequency and it is different in different object.
Final answer:
The belief that colored objects emit small color particles that reach our eyes is inaccurate. Modern physics teaches that color is due to the reflection and absorption of different wavelengths of light, as demonstrated by Sir Isaac Newton's prism experiments.
Explanation:
The historical belief that colored objects in nature produce small particles that subsequently reach our eyes, contributing to their different appearances, is not accurate according to modern understanding of physics and color perception. The nature of color in objects is due to the absorption and reflection of light. When white light (which contains the full spectrum of colors) hits an object, the object absorbs some of the light and reflects others. The color that an object appears to us is due to the wavelengths of light that are reflected and not absorbed. For instance, a red object looks red because it reflects the red part of the spectrum while absorbing other wavelengths.
In the seventeenth century, Sir Isaac Newton's experiments with prisms demonstrated that white light could be divided into visible spectrum colors, laying the groundwork for our understanding of color theory. This understanding was further extended by the concept of wave-particle duality in light, showing that light can exhibit properties of both waves and particles, but the idea of color particles specifically being emitted from objects to our eyes is a misconception.
carbon dioxde and atmospheric dust are minor components in Earth's atmosphere , but they play a role large role in climate change. Describe how carbon dixide can affect a change in climate.
Answer:
Carbon-di-oxide plays a major role in changing the climate.
Explanation:
Climatic change refers to new weather patterns being seen in the atmosphere. Carbon-di-oxide molecules absorb infrared radiations. So, they are said to absorb heat. This is the reason CO2 is even used for green house effect, in which heat from the sun is trapped causing the temperature to increase.
When carbon-di-oxide will increase, oceans will get warmer. This will lead to an increase in the water vapour. Thus, CO2 will eventually cause the Earth’s temperature to rise and hence causing global warming.
Which of the following is forgetting for a reason, such as forgetting where you parked your
car yesterday so that you can remember where you parked it today?
Select one:
a. Decay
b. Retroactive interference
c. Dementia
d. Motivated forgetting
Answer:
The answer is Retroactive interface but Motivated forgetting is also acceptable.
Explanation:
Retroactive interference is when old information interferes with learning new information. For example, you may have trouble remembering your new telephone number because your old number interferes with it.
Forgetting may also happen through motivated forgetting or forgetting for a reason. Sometimes we intentionally forget information, such as where we parked the car yesterday so that we can remember where we parked it today. We may also forget information that we find unpleasant or that produces anxiety. For example, a person may forget a dentist appointment.
Answer:
Motivated forgetting
Explanation:
Well I took the test and if you look in section 02.06 it says it
GETS BRAINILIST!!!!!What is the landform in the image? Image of a large area of flat or gently rolling land with low relief Dune Hill Lake Plain
Answer:
Hi! Your answer will be (D.) Plain.
Explanation:
Have a nice day!
Answer:
Plain :)
Explation:
Plains are a broad area of relatively flat land or one type of land on Earth, There are a lot around the world, about more than one-third of the land's area. :)
What 3 factors cause ocean tides?
Answer:
They occur when the Earth, the Sun, and the Moon are in a line. The gravitational forces of the Moon and the Sun both contribute to the tides. Spring tides occur during the full moon and the new moon.
The relationship between the masses of the Earth, moon, and sun and their distances to each other play a critical role in affecting the Earth's tides.
Which factor does not cause tides?
The wind is the primary force that causes ocean surface waves, but it does not cause tides. Tides are the daily changes in the level of ocean water at any given place. The main factors that cause tides are the gravitational pull of the Moon and the Sun
What are the three different tidal cycles that we experience on Earth?
As a result, different tidal cycles can be experienced in different regions of the world. They are called semi-diurnal, diurnal, or mixed semidiurnal tidal cycles.
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how would you describe the process of evaporating fresh water from seawater?
A) Chemical Change
B) Physical Change
C) Chemical Property
D) Physical Property
The process of evaporating fresh water from seawater is Physical change. So, the correct answer is (B).
What is an Evaporation?
Evaporation is the process in which liquid present on the surface changes into gas phase. It is the process of vaporization. It is the process by which liquid water enters the atmosphere as water vapour in the water cycle.
Evaporation can be seen on dry sunny days when wet cloth get dry easily or when the rain puddles disappear on a hot day. All these are the examples of evaporation in which liquid water is not vanishing, it is evaporating into gas called as water vapour.
Evaporation is the one of the main step in global water cycle. It is a physical change. It is a surface phenomenon in which the molecules having higher kinetic energy escape into the air from the uppermost layer of the liquid.
Thus, the process of evaporating fresh water from seawater is Physical change. So, the correct answer is (B).
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5. Which of the following will be directly affected in a bacterial cell that has a mutation in its gene for RNA
polymerase?
(1 point)
DNA replication
transcription
translation
gene regulation
Answer:transcribing
Explanation:
i took the test
Answer:
The correct answer is "transcription".
Explanation:
RNA polymerase is an enzyme that synthesize RNA from DNA. The main function of RNA polymerase in bacteria is to perform transcription: the synthesis of messenger RNA from a DNA template (gene) that is later used to translate proteins. A bacterial cell that has a mutation in its gene for RNA polymerase will be directly affected on the way it performs transcription. The mutation could have a lethal effect on the bacteria, because transcription is a essential process for life.
! 15 points !
Scientists have observed a sudden explosion in the sun followed by rapid changes in the sun's brightness. Which of these events would most likely occur due to this solar condition?
change in wind velocity
change in Earth's climatic pattern
increase in number of solar eclipses
increase in atmospheric pollution on Earth
Please help
Answer: Change in earth's climatic pattern.
Explanation: It is a known fact that human activities has depleted the earth surface over the years which as a result changes the dynamism at which the sun rays reaches the earth. the ozone layer protecting the earth surface from sun radiation has been depleted over time, this in-turn causing changes in climatic pattern. Activities such as release of emissions (carbon oxide, hydrogen sulphide, among others) directly to earth surface has negative effect on how the sun reaches the earth, hence; exposing the earth directly to sun radiation which now causes changes in climatic pattern.
Yo sup??
the answer to this question is option B ie
change in earth's climatic condition because
the sun affects our climate a lot the UV and infrared radiation helps in maintaining the earth's temperature.
Hope this helps
which statement describes the concept of uniformitarianism?
Answer:
Geological processes occurring today have always occurred in the past is a TRUE statement about uniformitarianism.
Hope this helps!
What is the Thalweg? (site 2)
Answer:
The legal principle, if a boundary b/t 2 political entities is stated as a waterway
Explanation:
Answer:
The Thalweg is a line that connects points (the lowest ones) into cross sections. This is usually along coasts, rivers, or valleys.
listed in the item box are individual steps that need to be ordered to find out more information about steps some have more details available when you click drag and drop the steps in proper order by placing each in his correspondent open rectangle be sure that the earlier step is placed next to the number one.
ITEM BANK:
Class Family Genus Kingdom
Order Phylum Species
________________________
1.
2.
3.
4.
5.
6.
7.
Answer:
Kingdom
Phylum
Class
Order
Family
Genus
Species
Explanation:
To classify the numerous organisms, we need a system which helps us to classify all the organisms so that it becomes easy for us to study about them. Carolus Linnaeus, a Swedish botanist developed a system of classification called Taxonomical classification. He classified all living organisms in eight ranks,
domain>Kingdom>Phylum>Class>Order>Family>Genus>Species.
( from general to specific)
Which receptor was used when you touched something with a light touch?
Mechanoreceptor
Pain receptor
Thermoreceptor
Answer:
The correct option is A. Mechanoreceptor
Explanation:
Mechanoreceptor can be described as a kind of a sensory receptor that generates the response for mechanical pressure. The receptors which bring light touch sensations are a type of mechanoreceptors which are named as Tactile corpuscles. They are receptors which are present in the nerve endings of the skin and are sensitive for light touches. We can say that they are the receptors which have the highest sensitivity present in them.
Cancer is named based on the types of cells or tissues where it
Answer:
The naming of cancers depends on both the factors.
Explanation:
Different type of cancers are named on the basis of location of its origin.
-carcinoma, -sarcoma, -blastoma are the terms used as suffix, with the Latin or Greek word for the organ or tissue from where it had originated.
For example: Breast cancer is known as Ductal carcinoma of Breasts.
[ because it initiates from the tubes(ducts) that carry milk from breasts to the nipples, and carcinoma as suffix ]