Answer:
BExplanation:
1. Amphibian's heart is three-chambered from which two are atria and only one is ventricle.
2. And there is two circulatory pathways having different routes.
3.There is mixing of oxygenated and deoxygenated blood in case of amphibians.
4. And in case of mammals there is no mixing of blood,, both the oxygenated and deoxygenated blood is completely separate.
5. Mammal's heart contain four chambers from which two are atria and two are ventricle, and they completely separate both the oxygenated and deoxygenated blood.
You have two tree forest communities. Community 1 has 20 species and each species has exactly 100 individuals in their populations. Community 2 has 20 species with one species "Which community has a higher species richness"? A. Community 1. B. Community 2. C. Both have the same richness. D. There is not enough information to answer the question.
Answer:
Option C, Both have the same richness
Explanation:
Given –
Community 1 has 20 species with each species having 100 individuals
Community 2 has 20 species with each species having 1 individual
This indicates that the species richness is the same in both the communities because species richness is defined by the total number of species in a given community. There is no relation between “species abundance with in a community” to the species richness.
Thus, option C is correct
The barn above looks red because certain rays of light are absorbed by the barn and other rays of light are reflected by the barn. What must be true about the original sunlight before it hits the barn?
Answer:
The original sunlight is a mixture of colors.
Explanation:
The sunlight is perceived by our eyes as white because it is a mixture of seven colors - violet, indigo, blue, green, yellow, orange, and red. When these colors of light separate from each other and are differentially absorbed and reflected, we can see the different objects in different colors. The reason for the differential absorption and reflection is that the different colors have different wavelengths. Therefore, the barn looks red because the red light is reflected by the barn and other lights are absorbed, however, the original color of the sunlight is white.Answer: the answer is “ The original sunlight is a mixture of colors“ :)
Explanation:
What are the fixed alleles in the human species?
O
A. The alleles that everyone has
O
B. The alleles that change most often
O
C. The alleles that are on the most chromosomes
O
D. The alleles that no one has
Fixed alleles are those that are the only variant that exists for a gene within a species, meaning every individual in the population has this allele. An example of unfixed alleles is the A, B, and O alleles of the ABO blood type system, which are not fixed because they occur in varying combinations in the population.
The correct answer to what fixed alleles are in the human species is A, the alleles that everyone has. Fixed alleles are those that are the only variant that exists for a gene within a species because all individuals are homozygous for that allele. An example of alleles that are not fixed in humans are the A, B, and O alleles of the ABO blood group system; these are common alleles present in the population that determine an individual's blood type. Alleles like A and B produce modifications on the surface proteins of red blood cells, while the O allele produces no modification.
In the case of the ABO blood system, the majority of human genes have two or more possible alleles or alternative forms of a gene that account for the genetic variation among people. However, a fixed allele would be one that is uniform among all individuals within a population, which means that no other allelic variants are present.
The water buttercup produces thin leaves underwater, but those same tissues will produce broad leaves above the water. individuals in the 1800's (when hunger and childhood diseases were common) averaged slightly over five feet tall, but their offspring in the 1900's were substantially taller on the average. these traits are:
Answer:
Environmental factos on gene expression
Explanation:
The water buttercup produces thin leaves underwater, but those same tissues will produce broad leaves above the water. individuals in the 1800's (when hunger and childhood diseases were common) averaged slightly over five feet tall, but their offspring in the 1900's were substantially taller on the average. these traits are environmental factos on the ability of genes to express themselves.
These traits are referred to as environmental factors on gene expression
type of trait.
TraitsThese are characteristics or features an organism has as a result of different
factors such as the following
GeneEnvironmentThe environmental factors such as hunger and childhood diseases made the
height of individuals to be lower in the 1800s.
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Which structures break down food and release energy?
Answer: I believe it should be the Mitochondria.
Explanation:
The structures that break down food and release energy are the mitochondria.
Which structures break down food and release energy?Mitochondria are tiny structures inside cells that help make energy in a process called cellular respiration. During cellular respiration, the mitochondria break down glucose and other molecules from food. They use oxygen to make ATP, which provides energy for cellular activities.
Mitochondria are found a lot in cells that need a lot of energy, like muscle cells. They are very important for many processes in the body. Besides producing energy, mitochondria also have important tasks in controlling how cells work, managing cell death, and adapting to changes in the surroundings.
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What is a domain? What are the three domains of life on earth?
What are the three domains of life on earth?
Bacteria, Archaea, and Eukaryota
Answer:Bacteria, Archaea, and Eukaryota
Explanation:
3. Explain how proper
nutrition is connected to
the main function of the
digestive system.
Colonialism is defined as:______
a. the maintenance of political, social, economic, and cultural dominance over a people by a foreign power for an extended period
b. an approach that contends industrialized nations continue to exploit developing countries for their own gain
c. the far reaching process by which peripheral nations move from traditional or less developed institutions to those characteristic of more developed societies
d. continuing dependence of former colonies on foreign countries.
Answer:
a. the maintenance of political, social, economic, and cultural dominance over a people by a foreign power for an extended period
Colonialism is defined as the maintenance of political, social, economic, and cultural dominance over a people by a foreign power for an extended period
Explanation:
Colonialism is the military, economic,cultural oppression and domination of one country over another for an extended period. Often times colonialism was resisted through language,history and identity construction. During colonialism, people often used one of the following strategies to cope:
SeparatismRe-creationSyncrestismMimicryActive participationAssimilationAnswer:
a.
Explanation:
This is the process that took place here in the Americas, in Africa, Oceania in some parts of Asia. Where a Power, sends settlers and maintain dominance over another one for a period.
Colonialism has been mostly designed as an exploitation way of enriching the metropolis, the powers.
There has been and there is some variations within but, basically that's the process.
what is homeostatis
Answer:
homeostasis is the stability or balance of a cell or a body... Homeostasis is a dynamic equilibrium not constant.
Explanation:
THE TENDENCY TO MAINTAIN A STABLE RELATIVELY CONSTANT INTERNAL ENVIRONMENT IS CALLED HOMEOSTASIS. THE BODY MAINTAINS HOMEOSTASIS FOR MANY FACTORS IN ADDITION TO TEMPERATURE.
HOPE IT HELP....❤❤Antidiuretic hormone provides a means of controlling ____________ output. During dehydration blood volume declines and ____________ concentration rises. The increased osmolarity of the blood stimulates the hypothalamus to stimulate the ____________ pituitary to release ADH. ADH will work on the kidneys to ____________ water into the bloodstream. A negative feedback system is used until the blood ____________ and osmolarity return to normal levels.
Answer:
1. Water
2. Sodium
3. Posterior
4. Reabsorb
5. Volume
Explanation:
1. ADH or anti-diuretic hormone is the hormone which maintains the level of water in the body as ADH helps in reabsorption of water in the kidney and produces concentrated urine.
2. During dehydration, the level of the water in the blood declines but the concentration of sodium ions increases which increases the osmolarity of the blood.
3. The increased osmolarity are sensed by the osmoreceptors which send the signals to the hypothalamus which stimulates the posterior pituitary to release the ADH or vasopressin hormone.
4. The ADH hormone binds the ADH receptors in the collecting tubule of the kidney which opens the aquaporins to reabsorb the water from the urine.
5. This process in negative feedback as the volume of the blood and osmolarity returns to the normal. Once the level is normal, sends the signals to inhibit the synthesis of ADH from the posterior pituitary.
Urine production can be controlled by antidiuretic hormone. Blood volume decreases and salt concentration increases with dehydration. The posterior pituitary is stimulated to produce ADH by the hypothalamus as a result of the blood's increased osmolarity.
To reabsorb water into the circulation, ADH will cooperate with the kidneys. Until the blood volume and osmolarity restore to normal levels, a negative feedback mechanism is employed. The posterior pituitary gland releases ADH, also known as antidiuretic hormone, in reaction to the blood's increased osmolarity.
ADH affects the kidneys to boost water absorption, which lowers the volume of urine generated. This lessens urine production and aids in keeping the body's water balance. ADH also assists in controlling blood pressure.
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Aminoglycosides ________. Group of answer choices block peptidases that cross-link glycan molecules block folic acid synthesis interfere with elongation of peptidoglycan attach to the 30S ribosomal subunit and disrupt protein synthesis damage cell membranes
Answer:
Aminoglycosides attach to the 30S ribosomal subunit and disrupt protein synthesis.
Explanation:
Mechanism of action of aminoglycosides:
Initially the penetrate the bacterial cell wall, to reach periplasmic space through porin channels.
Further transport across cytoplasmic membrane takes place by active transport by proton pump; an oxygen dependant process.
Aminoglycosides then bind 30S ribosomal subunits and interfare with the initiation complex. Induce misreading of genetic code on mRNA. Also causing the breakup of polysomes into monosomes thus ultimately disruping the protien synthesis.
Which of these accurately describes a difference between cancer cells and normal cells?
A.
Cancer cells divide less frequently.
B.
Cancer cells lack the ordered arrangement of normal cells.
C.
Cancer cells have a consistent size and shape.
D.
Cancer cell nuclei are always small and rounded in shape.
Which of these accurately describes a difference between cancer cells and normal cells?
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A.
Cancer cells divide less frequently.
B.
Cancer cells lack the ordered arrangement of normal cells.
C.
Cancer cells have a consistent size and shape.
D.
Cancer cell nuclei are always small and rounded in shape.
Answer:
B. cancer cells lack the ordered arrangement of normal cells.
Explanation:
The statement that accurately describes a difference between cancer cells and normal cells is cancer cells lack the ordered arrangement of normal cells.
CANCEROUS CELLS:
Cancerous cells are group of cells that possess an irregular manner of replication. This inability to regulate the cell division of cancer cells may caused by variety of reasons like mutation etc. Normal cells, on the other hand, divide at a steady state. Cell division is normal for every living cell as this is the way cells replicate themselves. However, cell division is controlled or regulated at different points during the cell cycle to prevent proliferation in rate of cell division, otherwise, cancer cells results. Therefore, statement that accurately describes a difference between cancer cells and normal cells is cancer cells lack the ordered arrangement of normal cells.Learn more about cancer cells at: https://brainly.com/question/436553?referrer=searchResults
Which description shows competition in an environment?
a
three organisms battling over limited resources
b
an organism that feeds on some food
c
an organism that finds a place to sleep
d
three organisms of the same species living in an area
Three organisms battling over limited resources shows competition in an environment. Thus, option A is correct.
what are the type of competition among the species?It is a natural interaction between two or more same or different organisms for the same resources like food, shelter, light, substrate etc.
This type of interaction shows an effect on the fitness between two competitive organisms.
The major factor influencing competition are the density of the individuals and the number of organisms.
The competition is one of the major driving forces for evolutions it is involve in adaptation of species according to changing environment.
On the basis taxonomy, competition of species can be interspecific and intraspecific, similarly on the basis of mechanism it is divided into interference, exploitative and apparent competition.
According to influence, it can be direct and indirect competition.
Thus, option A is correct.
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During the signal transduction process, the signal often triggers a signal transduction cascade. For example, a single activated protein A molecule activates hundreds of protein B molecules, and so on, until a cellular response occurs. What purpose does this cascade serve
Answer:
The cascade amplifies the cellular signal, thereby receptor activation lead to potent responses
Explanation:
Usual signal transduction is produced by protein phosphorylation, this posttranslational modification activates signal transductors in order to bind receptors and ligands. In multicellular organisms, the signal transduction pathways regulate critical cellular processes including, for example, cell communication
what happens when a ecosystem is in equilibrium.
All living things must remain in balance, or equilibrium, also known as homeostasis. Our bodies maintain a balance of many things such as temperature. If we are too hot we sweat and if we are too cold we shiver. Our temperature must remain in equilibrium.
Even larger collections of living things like ecosystems must be in balance too. An ecosystem is a collection of living and non-living things in an area. There are lots of types of ecosystems we already know, such as a forest or a meadow. Any collection of living and non-living things in an area is an ecosystem, even a small ecosystem like your backyard.
Resources are plenty and predator and prey relationships are healthy. No competition for resources.
Answer:
the ecosystem is "Balanced"
Explanation:
Natural ecosystems are often incredibly sensitive to change, such as the introduction or removal of a species. A healthy ecosystem is said to be in equilibrium, which is a relatively stable state that keeps population sizes within a sustainable range (not too many of a certain species alive or dead). Consider the case of bears (who only eat fish) and salmon (who are only hunted by bears):
How does a child inherit traits from its parents
Answer:
DNA
Explanation:Genetic inheritance occurs due to genetic material in the form of DNA being passed from parents to their offspring. ... Even though the offspring receives a combination of genetic material from two parents, certain genes from each parent will dominate the expression of different traits. Hobbies or habits are the most thing children learn from their parents as well as genes
Answer:
genes
Explanation:
Each of your parents has two copies of each of their genes, and each parent passes along just one copy to make up the genes you have. Genes that are passed on to you determine many of your traits, such as your hair color and skin color.
One of the major contributors to our understanding of vaccination was Edward Jenner.
What is Jenner’s contribution to the development of vaccinations? Choose the statement that best describes the work of Edward Jenner.
a) He was the first person to demonstrate that it was possible to make a vaccine against a bacterial infection.
b) He discovered the process of passive immunization--the transfer of protective antibodies to an individual.
c) Jenner developed the process of variolation, whereby he infected people with ground smallpox scabs to protect them from smallpox.
d) He demonstrated that inoculating people with crusts from cowpox lesions protected them from smallpox infection.
Answer:
I believe c
Explanation:
For several decades now, amphibian species worldwide have been in decline. A significantproportion of the decline seems to be due to the spread of the chytrid fungus,Batrachochytrium dendrobatidis (Bd). Chytrid sporangia reside within the epidermal cellsof infected animals, animals that consequently show areas of sloughed skin. They can also belethargic, which is expressed through failure to hide and failure to flee. The infection cycletypically takes four to five days, at the end of which zoospores are released from sporangiainto the environment. In some amphibian species, mortality rates approach 100%; otherspecies seem able to survive the infection.If Bd cannot grow properly at temperatures above 28°C (82°F), then, assuming theamphibians can survive, in which time or place should the chytrid infection proceed mostrapidly?1. cooler months2. warmer months3. lower altitudes4. higher altitudes
Answer:
Infection with these microorganisms would be even more noticeable in cold stages where temperatures are less than 28 degrees, since in this way the microorganisms would not survive in the external environment and would less infect amphibians.
Explanation:
Also keep in mind that water at different latitudes may have a greater or less warmth (that is the reason why in some areas it is said that its boiling point is not 100 degrees Celsius but around 83).
The warmer the water, the more amphibian mortality because there will be more infection since the microorganism manages to survive in an environment suitable for its needs.
Echinoderms _____. _____ Select one: a. have an exoskeleton of hard calcareous plates b. often use tube feet to move around in their environment c. digest their food outside of the organism d. circulate hemolymph in their water vascular system e. are most often found in freshwater environments
Answer:
B. often use tube feet to move around in their environment
Explanation:
Tube feet are tiny tubular projections of echinoderms on the underside (oral side). They are a member of the echinoderm water vascular system.
Tubular feet are used for feeding, breathing and shifting. They are arranged around the sides, in grooves. They work by hydraulic pressure. They are used to transfer food in the centre to the oral mouth, and may stick to surfaces. Tube feet allow certain animals to stick and travel slowly to the ocean floor. for example starfish uses tube feet for the above functions.
Hence, the correct option is B.
What are the roles of a decomposer ?
what state of matter does light travel through fastest
Light actually travel through a vacuum the fastest but state of matter wise it's a gas
What is a useful first step in assessing potential environmental health risks in a community? a.Conduct risk assessments of select individuals b.Survey community members Review c.Environmental Protection Agency (EPA) reports d.Perform a windshield survey
Answer: d. Perform a windshield survey
Explanation:
Environmental health risks include air pollution, disease vectors, lack of water and inadequate sanitation, electronic waste, and chemical hazards.
Conducting a windshield survey is a valuable first step in identifying possible safety threats to the environment. This offers first-hand neighbourhood information and areas of concern which need to be investigated.
Hence, the correct option is d.
What are the gene product of the a and B genes
Answer:
The A gene determines the product N-acetylgalactosaminyltranferase activity. The B gene determines galactosyltransferase activity.
Explanation: it is just amazing
Answer:
read it :)
Explanation:
The A gene determines the product N- activity. The B gene determines galactosyltransferase activity. The O gene does not produce a functional enzyme. The enzyme products of the A and/or B genes act on H substance to convert it to A and/or B antigens.
"What does the competition coefficient in the Lotka-Volterra competition model describe"? A. The difference in the carrying capacities of two species B. The effect of adding one individual of a species on the population growth rate of another species C. The number of individuals needed to drive another species to extinction D. The area of zero population growth
Answer:
The competition coefficient in the Lotka-Volterra competition model describes B. The effect of adding one individual of a species on the population growth rate of another species
Explanation:
The competition coefficient in the Lotka-Volterra competition model explains species competing for some common resource. It explains the effect of adding one individual of a species on the population growth rate of another species. They will compete for food with the colonies located near to them. When using equations for predation, the base population model is exponential.
Answer:
D. The area of zero population growth
Explanation:
Competition coefficient can be explained as the degree to which an individual of one species affects through competition. It can also be described as the growth or equilibrium level of a second species' population, relative to the effect of an individual of the second species.
The Lotka-Volterra model predicts that there could be a possibility of a stable coexistence of two species, only when intraspecific competition has a greater effect than interspecific competition.
In conclusion, the competition coefficient in the Lotka-Volterra competition model resulted in zero isocline, which shows one species having a growth rate (dN/dt) of zero.
Please Help Quick!
A resource is being used by a population.
Which graph represents a sustainable yield of that resource?
Graph A
Graph B
Graph C
Graph D
Answer:
B
Explanation:
because according to the graph the amount of resources doesn't vary much
The graph B represents a sustainable yield of a resource.
What are resources?Resource refers to all the materials available in our environment which are technologically accessible, economically feasible and culturally sustainable and help us to satisfy our needs and wants.
Moreover, resources can broadly be classified upon their availability — they are classified into renewable and non-renewable resources. They can also be classified as actual and potential on the basis of the level of development and use, on the basis of origin they can be classified as biotic and abiotic, and on the basis of their distribution, as ubiquitous and localized (private, community-owned, national and international resources).
Hence, an item becomes a resource with time and developing technology. The benefits of resource utilization may include increased wealth, proper functioning of a system, or enhanced well-being.
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Two of gold's most common uses are jewelry and coins. In which other
products are you likely to find gold?
O
A. Glass, cement, and fiberglass
B. Fertilizers, batteries, and cleaners
O
C. Construction products, pottery, and porcelain
O
D. Aircraft windows, medicines, and electronics
Answer: Aircraft windows, medicines, and electronics
Explanation:
A plant makes glucose during photosynthesis. Glucose consists of the elements carbon, hydrogen, and oxygen. What is the source of the elements for the glucose that the plant makes? Construct an explanation.
Answer:
The carbon source is the air, the oxygen and hydrogen source is the water.
Explanation:
The chemical formula of glucose is C6H12O6, as we can see it consists of carbon, hydrogen and oxygen atoms. The plants, using the energy from sunlight and these elements, produce glucose to use and store for energy.
The carbon that is used for glucose is provided from the carbon dioxide that is used for photosynthesis. The hydrogen and oxygen that is used for glucose is provided from the water that the plants receives.
I hope this answer helps.
Because the urchin life involves two or more ecological niches, they are more susceptible to predation and exposure to environmental toxins. What environmental conditions, predators and toxins might they be exposed to at each stage?
Answer:
Sea urchins are spiny animals found in the aquatic habitat. They have similarities as the hedgehog and are referred to as Sea hedgehog.They feed on algae.
They are exposed to these conditions which include:
Environmental conditions- Changing water temperature and algal bloom
Predators- Crabs, Eels, Fish, Sea otters, Bird, Man
Environmental Toxins- Irgarol, Diuron, Polychlorinated biphenyl congeners.
You are studying leaf development in a member of the mustard family. You identify several mutants of interest in this plant and make pure (true-breeding) lines of each mutant for further study. You decide to conduct a genetic analysis of these mutant lines by crossing each with a pure wild-type line. The numbers in the F2 indicate the number of progeny in each phenotypic class. Three crosses between pure lines of flowers. The first cross is between twist and wild type flowers. F1 flowers have twisted leaves. When F1 flowers were crossed with each other, 53 twisted and 18 wild type flowers were obtained. The second cross is between forked and wild type flowers. The F1 generation is all forked, and when they are crossed with each other, 49 forked and 16 wild type flowers were obtained. The third cross is between pale and wild type flowers. The F1 generation was of middle coloring and when they were crossed with each other, 17 wild type, 16 pale, and 34 middle type flowers were obtained. From these results, determine the relationship between the mutant allele and its corresponding wild-type allele in each line.
Answer:
•The relationship between the twist and the wild type flower in the first crossing is known as a COMPLETE DOMINANCE
•The relationship between the forked and the wild type flower in the second crossing is also known as a COMPLETE DOMINANCE
•The relationship between the pale and the wild type flower in the third crossing is known as an INCOMPLETE DOMINANCE
Explanation:
A complete dominance is characterised by having one of the genes (the dominant gene) in an heterozygous condition, completely masking the effect of the other (the recessive gene) of thesame allelic pair. E.g. if the genes in allelic is represented with Aa, "A" is said to completely dominate "a" if it does not allow "a" to Express itself phenotypically.
The heterozygous condition is always the result of the F1 generation
and the F2 generation of a Complete dominance is always characterised by a phenotypic ratio of 3:1 which is in line with the results gotten from the first crossing and the second crossing as stated in the question.
An complete dominance is characterised by having an intermediate progeny in the F1 generation which was evident in the result of the third crossing. Also a phenotypic ratio of 1:2:1 in the F2 generation is also a characteristic feature of an Incomplete dominance relationship which was also evident in the third crossing.
The twisted and forked traits are dominant to the wild-type, as shown by their 3:1 phenotypic ratios in the F2 generation. For the pale trait, the 1:2:1 F2 generation phenotypic ratio suggests incomplete dominance with an intermediate phenotype in heterozygotes.
To determine the relationship between the mutant allele and its corresponding wild-type allele in each line, we can refer to Mendel's laws of inheritance, specifically considering the phenotypic ratios in the F2 generation. The first and second crosses showed a phenotypic ratio close to 3:1, indicating that the twisted and forked traits are likely dominant over their corresponding wild-type phenotypes. Thus, the mutant allele for twist and forked would be dominant to the wild-type allele.
For the third cross involving pale and wild-type flowers, the phenotypic ratio is 1:2:1 in the F2 generation, with wild type, pale, and middle type flowers. This suggests incomplete dominance, where the heterozygous condition results in an intermediate phenotype (middle type). Therefore, for the pale mutant, the relationship with the wild-type allele is one of incomplete dominance.
ABO blood grouping of humans is an example of co-dominance. Homozygotes (IAIA and IBIB) express either the A or the B phenotype. Heterozygotes (IAIB) express both phenotypes equally and the IAIB individual has blood type AB. Blood type O is the result of the genotype IOIO: this blood type is considered the recessive trait and IO is the recessive allele for blood type. Imagine a genetic cross between two people, blood type AB. What is the probability that these people will have offspring with type B blood? A) 0% B) 10% C) 25% D) 50%
Answer:
C
Explanation:
Crossing IA IB × IA IB,
IA IA - 25% blood type A
IA IB - 50% blood type AB
IB IB - 25% blood type B
Due to codominance chracter of ABO blood grouping offspring of type B blood is 25%, hence option c is correct.
What is ABO blood grouping?The ABO blood group illustrates Codominance. Gene I, which has the three codominant alleles A, B, and O, regulates the ABO blood grouping.
if Crossing of IA IB × IA IB,
IA IA - 25% blood type A
IA IB - 50% blood type AB
IB IB - 25% blood type B
Codominance is best illustrated with the ABO blood group. Gene I, which has the three codominant alleles A, B, and O, regulates the ABO blood grouping.
The A and B alleles are mutually dominant. One A allele and one B allele are found in people with the blood type AB. Their blood type is AB as both alleles are expressed simultaneously.
Therefore due to the Codominance character in blood grouping, option c is correct.
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