Answer:
1). All living organisms are constantly involved in 'a struggle for existence'.
2). In a population, those that tend to survive and reproduce are the individuals whose variations gives them competitive advantage over the rest.
Explanation:
Darwin, thus, identified environmental pressures as the main cause of natural selection. They cause favourable variations to accumulate and unfavourable ones to be weeded out. Over thousands of generations, favourable variations, naturally selected by he environment, accumulate sufficiently to give rise to new species from ancestral species. Therefore, according to Darwin, natural selection, acting through environmental pressure, is the driving force behind evolutionary change in the natural world.
Darwin's theory of evolution explains that all life has evolved from a common ancestor through a process called natural selection. Natural selection involves individuals with advantageous traits being more successful at survival and reproduction, leading to these traits being more prevalent in subsequent generations. This theory is a fundamental part of understanding biological diversity and species change over time.
Explanation:Darwin's theory of evolution explains that all life has evolved and diversified from a common ancestor, primarily through a process he called natural selection. This process involves certain individuals within a population possessing more favorable adaptive characteristics, allowing them to survive, reproduce, and pass these characteristics onto the next generation. Over time, through natural selection, organisms evolve in response to their changing environment, leading to both the unity and diversity of life.
The theory of evolution by natural selection describes a mechanism for species change over periods of time. This was a groundbreaking concept that challenged the then-dominant belief that species were static and unchanging, as it proposed that species adapt and change in response to environmental pressures over generations. This concept was advanced by both Charles Darwin and Alfred Russel Wallace, who independently observed similar patterns across species and ecosystems.
Natural selection, according to Darwin, was an inevitable outcome of three principles that operated in nature. Firstly, characteristics of organisms are inherited. Secondly, more offspring are produced than can survive due to limited resources, leading to competition within each generation. Thirdly, offspring vary in their inherited characteristics. Individuals with characteristic variations that best equip them to compete for resources will therefore have a survival advantage and reproduce more successfully, leading to these traits being more prevalent in subsequent generations.
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2)Through the action of osteoclasts,
Answer:
Osteoclasts are the type of cells which are responsible for the absorption of calcium from bones.
Explanation:
Osteoclasts is special type of cells which is released by parathyroid gland when the blood have low levels of calcium. Osteoclasts absorb calcium from the bones and add this calcium into the blood to increase the calcium level. If calcium is present in very high amount so this calcium is stored in the bones of the body and extracted when needed by the body.
What proportion of tropical storms turn into hurricanes?
Using the genotypes and phenotypes provided from the iguana gene pool, which statement is NOT correct?
A.Webbed feet is the recessive trait
B.WW x ww produces offspring with no webbing.
C.2 iguanas with no webbing could have an offspring with webbing,
D.Crossing an iguana with webbed feet with one with no webbing would
produce iguanas ALL with no webbing because this is the dominant trait.
Answer:
Crossing an iguana with webbed feet with one with no webbing would produce iguanas ALL with no webbing because this is the dominant trait.
Explanation:
If an iguana heterozygous for no webbing (Ww) is crossed with an iguana with webbed feet (ww), they have a 50% chance of having an offspring with the recessive trait, webbed feet.
This is the result of fertilization, in the early stages of growth and development
Answer:
Cell or zygote is the product of the fertilization process.
Explanation:
Zygote is formed by the fusion of sperm cells of male and egg cells of female in the process of fertilization. Zygote is diploid cell i. e. double number of chromosomes while male sperm cell and female egg cell are haploid i. e. half number of chromosome. Zygote contains half genes from father and half from mother cell.
Describe the path taken by a carbon atom as it moves from being part of the carbon dioxide in the air to being part of a starch in a plant. (5Marks)
Answer:
Photosynthesis
Explanation:
1. Diffusion of CO2 into the leaves by stomata
2. CO2 reacts with water in presence of sunlight
3.Chlorophyll in chloroplast act as a catalyst
4.Photosynthesis takes place
5.Product contains glucose that is C6H12O6 and is converted to starch
Plants get the carbon dioxide they need from the air through their leaves. It moves by diffusion through small holes in the underside of the leaf called stomata. These let carbon dioxide reach the other cells in the leaf, and also let the oxygen produced in photosynthesis leave the leaf easily.
What is photosynthesis?Photosynthesis is a process that occurs in the chloroplast organelle of plant cells. The typical light reaction of photosynthesis takes place inside the thylakoid membrane of the chloroplast. The chief reactants such as water and carbon dioxide participate in the reaction. The water gets oxidized in the reaction to release oxygen as a product. The carbon dioxide gets reduced.
Thus, this is the answer.
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What would be the most likely effect of adding wolves to the park?
O
A. Increased snowshoe hare population
O
B. Decreased balsam fir population
O
C. Increased maple population
O
D. Increased beaver population
SOMEBODY HELP!!! Other people said the increase of balsam fir but mine says a decrease in a balsam fir
The most likely effect of adding wolves to the park would be an increased maple population (Option C).
What is a food web?A food web is a graphic diagram indicating the relationships between different trophic levels of organisms.
In this case, the wolves eat primary consumers, thereby increasing the population of producer plants.In conclusion, the most likely effect of adding wolves to the park would be an increased maple population (Option C).
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The addition of wolves to a park is likely to result in a decreased balsam fir population, as wolves would reduce the number of herbivores that feed on these plants.
Explanation:When considering the addition of wolves to a park, one can look at the example of predator-prey dynamics, such as the relationship between lynxes and snowshoe hares. Wolves, being apex predators and keystone species, are likely to influence the ecosystem in several ways. Large predators typically control the population of herbivores, which in turn affects the vegetation.
In this context, adding wolves to the park would most likely lead to a decreased population of herbivores which the wolves prey upon. If snowshoe hares are among those herbivores, this would result in a decrease in their numbers. As a result, any vegetation that the hares preferentially feed upon, such as the balsam fir, could potentially see an increase in population due to reduced feeding pressure.
Therefore, the most likely effect of adding wolves to the park would be option B. Decreased balsam fir population. This is because the wolves would reduce the population of herbivores that would otherwise feed on the balsam fir, giving the plant population a chance to recover and thrive without as much grazing pressure.
An electron transport chain that produces ATP is part of both the cellular respiration
process and
A/An is a group of organs that work together to perform a common function. A/An is a group of tissues that work together to perform a common function. A/An is a group of organ systems that work together to perform a common function. A/An is a basic unit of structure and function of all living things. A/An is a group of cells that work together to perform a common function.
Answer:
1. Organ system
2.organ
3.Organism
4.Cell
5.Tissue
Explanation:
An organ device is an aggregate of organs (e.g., heart, lungs, eyes, kidneys, and many others that work collectively for a particular function. The human body includes eleven interrelated organ systems that manipulate all crucial frame capabilities.
what is an instance of an organism?The definition of an organism is a creature consisting of a plant, animal, or a single-celled existence form, or something that has interdependent elements and that is being compared to a living creature. An example of an organism is a dog, person, or bacteria.
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What do solid and hazardous wastes have in common?
Answer:
Hazardous and solid wastes can be solid, liquid and gaseous form.
Explanation:
Hazardous wastes are wastes that are composed of harmful or toxic substances which is generated from industries, households, hospital e.t.c that are threat to humans and their environment.
Solid wastes are discharged or absconded materials such as refuse, sludge, gabbage, from water treatments, air pollution, household, industries e.t.c.
A red flower is crossed with a pink flower, how many offspring are:
Red?
White?
Pink?
Which statements describe the energy in a food web? Select three options.
When an organism eats another organism, it loses energy.
O Producers have the greatest amount of available energy.
O Energy can follow many different paths.
When an organism eats another organism, it gains energy.
O Producers have the least amount of available energy.
Energy always follows a single path.
Answer:
Producers have the greatest amount of available energy,
Energy can follow many different paths.
When an organism eats another organism, it gains energy.
In a food web, energy transfers from one organism to another through consumption. Producers, like plants, have the highest energy levels as they produce energy directly from sunlight through photosynthesis. Unlike a simple food chain, a food web shows multiple paths of energy transfer.
Explanation:In a food web, energy is transferred from one organism to another through consumption. The correct statements that describe the energy in a food web include: 'When an organism eats another organism, it gains energy', 'Producers have the greatest amount of available energy', and 'Energy can follow many different paths'.
When a prey is eaten by a predator, the predator gains energy obtained from the food it has consumed. Next, in any ecological network, producers, such as plants, have the highest amount of energy available. This is because they generate energy directly from the sun through photosynthesis. Lastly, unlike a simple food chain where energy follows a single path, a food web shows that energy can travel through multiple paths as organisms can have multiple predators and prey.
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What determines how much kinetic energy an object has?
Question 1 options:
Only mass
Mass and speed/velocity
Height and mass
only speed
Answer:
the mass (m) of the object and the speed (v) of the object.
Explanation:
Answer:
Mass and speed/velocity
Is a swan a type of duck?
"The answer is no, a swan is not a type of duck.
Swans and ducks are both members of the Anatidae family, which also includes geese. However, they belong to different genera within this family. Swans are typically placed in the genus Cygnus, while ducks are placed in the genus Anas, among others. Swans are generally larger than ducks and have distinct physical characteristics, such as a longer neck and a different shape of the bill. Additionally, swans and ducks exhibit different behaviors and have different habitats and diets. Therefore, while they are related, a swan is not classified as a type of duck."
Why blood from the small intestines goes to the liver before it goes to other organs
Answer:
Blood goes from small intestine to the liver in order to remove toxic substances and store the nutrients. After that, the blood is sent to all parts of the body.
Explanation:
Liver is an important organ of the body which is responsible for the purification of blood coming from the small intestine and then it send to all organs of the body. This blood contains nutrients which is absorbed in the small intestines and some toxic substances which is purify by liver.
After a long soccer practice, Jack felt his pulse increase. As he cooled down, his pulse began to slow. Since he'd been studying the circulatory
system in science class, he knew why his pulse slowed.
What is the main structure of the circulatory system that makes the blood move through the body?
O
A. artery
O
•
B. lymph vessels
C. heart
D. lungs
Answer:
heart
Explanation:
The heart is the main structure of the circulatory system that makes the blood move through the body, hence option C is correct.
What is the structure of the heart?A fist-sized organ, the heart circulates blood throughout your body. It serves as your circulatory system's main organ. Four major muscle-driven chambers make up your heart, they are each powered by electrical impulses.
Your nervous system and brain control how your heart beats. To obtain oxygen into the blood, the circulatory system (cardiovascular system) pumps blood from the heart to the lungs.
The remainder of the body receives oxygenated blood from the heart via arteries. Oxygen-depleted blood is returned to the heart by veins to restart circulation.
Therefore, the heart is the main structure of the circulatory system.
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The graph shows that while the usage of minerals in the U.S. increased by a large amount between 1900 and 2006, there were a few points in time during which usage briefly decreased. In recent times, these dips typically represent recessions, depressions, or other types of economic crisis. Which of the following most likely explains why mineral usage changes during times of economic crisis?
Answer:
Mineral usage per person decreases
Explanation:
Answer:
We could increase the percentage of minerals obtained through recycling. Doing so might help conserve the number of new minerals being extracted and used.
Explanation:
trust me I'm correct
It is likely that a member of the
Lepidoptera family seen flying durin
the day is
a. a butterfly
b. a moth.
a c. another kind of winged inscot
A member of the Lepidoptera family seen flying during the day is likely a butterfly.
Lepidoptera, which includes butterflies and moths, are easily identified by their two pairs of scaled wings, with the forewings larger than the hind wings. The general difference in behavior between the two is that moths are usually night-flying insects that are more cryptic or camouflaged within their habitats, whereas butterflies frequently fly during daylight hours and rely less on camouflage.
Butterflies are more visible than moths during the day because many butterflies pollinate flowers which are brightly colored, open during the day, and produce nectar specifically to attract daytime pollinators.
Moths, such as the Noctuidae family member like the corn earworm, tend to be active at night and are important pollinators for night-blooming plants, forming symbiotic relationships where the plant is pollinated while the moth feeds.
Using the genotypes and phenotypes provided from the iguana gene pool, which statement is NOT correct?
A) Webbed feet is the recessive trait.
B) WW x ww produces offspring with no webbing.
C) 2 iguanas with no webbing could have an offspring with webbing.
D) Crossing an iguana with webbed feet with one with no webbing would produce iguanas ALL with no webbing because this is the dominant trait.
Do you have the provided iguana gene pool?
Statement B is incorrect as crossing a homozygous dominant (WW) and a homozygous recessive (ww) iguana would produce all heterozygous (Ww) offspring with the dominant phenotype of no webbing.
In addressing which statement is NOT correct when considering iguana genotypes and phenotypes, careful analysis of genetic principles is required.
Statement A suggests that webbed feet are recessive, which implies that ww would be the genotype for webbed feet. Statement B is incorrect because a cross of WW (no webbing) with ww (webbed feet) according to Mendelian genetics would produce offspring with a Ww genotype, which would display the dominant trait of no webbing.
Statement C is possibly correct because two iguanas with no webbing could be heterozygous (Ww) and thus, could produce offspring with webbing if both pass on the recessive allele (w).
Statement D would produce offspring with webbed feet if the dominant trait was no webbing as the cross of a heterozygous dominant individual (Ww) with a homozygous recessive (ww) would result in half the offspring being heterozygous (Ww and phenotype of no webbing) and half being homozygous recessive (ww with webbing), not all with no webbing as the statement incorrectly suggests.
Which of these increases as greenhouse gas pollution increases?
A. Ocean salinity
B. Rate of thermohaline circulation
C. Ocean surface temperature
D. Thickness of freshwater ice sheets
Answer:
B. rate of thermohaline circulation
Explanation:
as increasing the green gas amount warms up earth
What is an important requirement for a manned spacecraft traveling through space?
Answer: The presence of breathable oxygen in addition to a sustainable state of pressure.
Explanation:
Final answer:
Manned spacecraft require sophisticated life support, radiation protection, autonomous navigation, communication systems, sustainable power sources, and sufficient fuel capacity to safely travel through space and manage the challenges of the environment and distance from Earth.
Explanation:
An important requirement for a manned spacecraft traveling through space is the ability to provide life support systems that maintain a stable environment suitable for human life. This includes regulating the spacecraft’s internal temperature, ensuring the crew receive adequate oxygen, and managing waste and water. Additionally, radiation protection is crucial, as astronauts are exposed to elevated levels of cosmic and solar radiation. Spacecraft must also be equipped with autonomous navigation systems and communication systems that can operate despite the significant time delay in signals to and from Earth, especially when traveling to distant planets like Mars or the outer solar system. Adequate power sources, such as solar arrays or nuclear batteries to provide energy for the duration of the mission, are also essential. Lastly, the spacecraft must contain enough fuel to not only escape Earth’s gravity but also to allow for mid-course corrections, orbit insertion, and a potential return journey to Earth.
Why is surface tension important
Answer:
Surface tension determines the efficiency of detergent formulation. The high surface tension of water makes it a relatively poor cleaning detergent. By increasing the temperature of water, the cleaning efficiency increases slightly as surface tension decreases.
Explanation:
A student says that ""ALL DNA codes for proteins."" Do you agree with her? Why or why not?
It is not true that all DNA codes for proteins, as only some amount of DNA is coding.
What is a protein coding gene?Protein coding sequences are DNA sequences that are transcribed into mRNA and then translated into a polypeptide chain by the corresponding mRNA molecules.
In a protein coding sequence, every three nucleotides, known as a codon, encodes one amino acid in the polypeptide chain.
Long non-coding sequences in eukaryotic DNA separate relatively infrequent gene islands.
When DNA is extracted from living cells, the proteins (including histones) are usually dissolved away. As a result, long strands of bare DNA are formed that retain their genetic information.
Only about 1% of DNA contains protein-coding genes; the remaining 99 percent is noncoding. Noncoding DNA does not contain protein-making instructions.
Thus, it can be concluded that all DNAs does not code for all proteins.
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Final answer:
All DNA does not code for proteins; genes within DNA do code for specific proteins, but there are regions of DNA with regulatory, structural, or other non-coding roles, and only certain genes are expressed in specific cell types for protein synthesis.
Explanation:
While it is true that DNA contains the instructions for protein synthesis, it is not accurate to say that all DNA codes for proteins. There are segments of DNA that play regulatory, structural, or other roles within the genome that do not code for proteins. For instance, only specific genes are expressed in a given cell type, which means that only certain portions of DNA are activated and used to make proteins that the cell needs. Moreover, the process of gene expression and protein synthesis, which includes transcription and translation, involves using the information encoded by genes to create proteins.
The Central Dogma of Molecular Biology explains that DNA is used to create RNA, which then serves as a template to synthesize proteins. Each gene, a segment of DNA, carries the code for a specific protein and through the genetic code, which is universal across nearly all species, the sequence of DNA bases is interpreted to produce the required proteins. However, not all DNA segments are involved in coding for proteins. Some DNA sequences regulate gene expression, some are involved in structural configurations, and yet others remain as non-coding regions with varied functions within the organism's genome. Therefore, it is a simplification to assert that all DNA codes for proteins.
Which of the following is NOT a type of tissue found in plants?
O Dermal
O Non-living
O Vascular
O Ground
Plants have three main types of tissue - dermal, vascular, and ground. 'Non-living' is not considered a type of tissue in plants as plant tissues are primarily formed of living cells.
Explanation:Plants consist of three main types of tissues, namely: dermal, vascular, and ground tissue. Dermal tissue, which comprises the plant's outer protective coating, vascular tissue, responsible for transporting water, nutrients, and sugars between different parts of the plant, and ground tissue, which includes all tissues not part of the dermal or vascular systems and typically serves a metabolic function. However, 'Non-living' is NOT a type of tissue found in plants. In a physiological sense, it's typically the living cells that form the various plant tissues.
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When looking into a shop window on a bright sunny day you see an image that is a mixture of your image and the items on display. The principles of light involved are
reflection and absorption
refraction and absorption
refraction and transmission
reflection and transmission
Answer:
D
Explanation:
because it is reflecting off the window and traveling through.
Answer:
D
Explanation:
light reflects or bounces off the window because the material of the window (in this case glass) reflects the light back to the sun and glass makes white light .White light can't be absorbed , but can be reflected. And the sun shines light through the window which is called transmission because its going in a direction(through the window).
Which DNA or RNA consists of a single copy of a gene
Which molecules are products of photosynthesis
Answer:
glucose and oxygen is produced from photosynthesis
Through what process do our cells produce ATP?
Answer:
The process human cells use to generate ATP is called cellular respiration. It results in the creation of 36 to 38 ATP per molecule of glucose. ... The two ATP-producing processes can be viewed as glycolysis (the anaerobic part) followed by aerobic respiration (the oxygen-requiring part).
Explanation:
hope this helps!:D
. In which phylum do organs and organ systems first appear?
a. Annelida
b. Hemichordata
c. Nematoda
d. Platyhelminthes
Answer:
The answer is d. Platyhelminthes
If a product is made from FSC certified wood, which of the following is probably true about where the wood came from? (Select the THREE best answers.)
Question 2 options:
Habitats of animals were respected as much as possible.
The area is becoming deforested.
The forest is managed sustainably.
The workers that cut down the trees were not paid.
The working conditions in the forest are safe.
The indigenous people of the forest were moved to a safe location.
Answer:
Habitats of animals were respected as much as possible.
The forest is managed sustainably.
The working conditions in the forest are safe.
Explanation:
The Forest Stewardship Council (FSC) is a non-profit organization that tends to promote sustainability of forests and protects the forest species by ensuring forest resources that are of social and economic values are explored in an environmental-friendly manner. So if a wood is FSC certified it means it came from a forest that is well preserved and where sustainable practices are being observed strictly.
Therefore, we can infer that an FSC certified wood most probably came from the following areas which connotes sustainability and preservation of the forest resources is pursued strictly to maximize its social and economic benefits and prevent deforestation and loss of habitats of animals:
Habitats of animals were respected as much as possible.The forest is managed sustainably.The working conditions in the forest are safeUse the image to answer the questions.
is a producer.
is a consumer.
Answer:
B is a producer
C is a consumer
If the grass contains 100,000 kcal of energy, how much energy will the zebra receive?
10,000 kcal
Explanation: