Answer:
Explanation:o relative page
Answer:
Relative age
Explanation:
The way I used to think of relatives as like a family. The bottom layer is the oldest and it works it way up. Then I relate faults and things like that as well.
What effect does the smoke have on the pH of water?
Verified Answer ✔️
The ph of smoke disrupts the natural ph of water( which is 7, the neutral ph) in the atmosphere causing it to become acidic . This is dangerous as it will also have effects on rain and soil ph.
Final answer:
Smoke introduces pollutants into the environment that can dissolve in water, forming acids and lowering the water's pH, making it more acidic. This acidification can lead to consequences like acid rain and has broad implications on aquatic life, material corrosion, and water treatment.
Explanation:
Smoke, particularly from combustion sources such as vehicles and power plants, produces pollutants like NOxs (Nitrogen Oxides), SOxs (Sulfur Oxides), CO (Carbon Monoxide), CO₂ (Carbon Dioxide), and various inorganic and organic volatile organic compounds (VOCs) that can significantly influence the acidity of water bodies. When these compounds dissolve in water, they form acids such as sulfuric, nitric, and carbonic acids, which lower the water's pH level, making it more acidic than its neutral state (pH=7). This alteration in pH can have profound effects on both the aquatic environment and the materials the water contacts.
Acid rain is a direct consequence when these acidic compounds are absorbed by rain clouds. It poses a threat to ecosystems, corroding metals, and affecting the structural integrity of buildings. Moreover, it's essential to understand that the pH of water is a critical measure of its reactive characteristics, where low pH levels indicate corrosive properties harmful to metals, while high pH levels suggest alkaline water is prone to scaling. The pH of water also significantly influences its treatment and use.
Which answer choice correctly describes why metals are good conductors of thermal energy?
Their atoms have free-floating electrons that easily pass kinetic energy throughout the metal.
Explanation:
The metallic structure of metals allows for delocalized electrons. This means these free electrons can no longer be associated with only one atom in the metallic element but rather the electrons can move freely within the lattice. These electrons can carry with them energy and transmit it within the metal. This is why metals are good conductors of heat and electricity. The more delocalized electrons the metal has (such as Aluminium) the better it is at conducting heat and electricity.
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Answer:
Their atoms have free-floating electrons that easily pass kinetic energy throughout the metal.
Explanation:
just did the quiz
Which discovery is most directly related to careers in biology?
A. the formation of a new space program to launch flights to Mars
B. the discovery of the genes that are responsible for Alzheimer’s disease
C. the unearthing of an ancient civilized community in the Pacific Northwest
D. the creation of a new synthetic material that is used in electronics manufacturing
Explanation:
Biology is the study of Life and living organisms. Any person associated with research or scientific studies of living organism is directly related to careers in biology.
Alzheimer's disease is a genetic defect caused in living beings. The genes causing this disease are:
Amyloid precursor protein (APP) Presenilin 1 (PSEN1) Presenilin 2 (PSEN2)Due to mutation of these genes the nerve cells get damaged and patients begin to show the symptoms usually at the age of 60 and above. The genetic test results can help in early prevention and cure to Alzheimer's disease. Though research is being continued to find if there are more genes involved.
How does the cell theory demonstrate this definition of theory
Final answer:
The cell theory is a widely accepted scientific theory in biology that explains the cellular basis of all living organisms and how new cells arise from existing ones. It serves as a prime example of a scientific theory as it integrates all known data about cellular life and remains unrefuted by evidence.
Explanation:
The cell theory exemplifies the definition of a theory in science by offering a broad and widely accepted explanation for a variety of biological phenomena. This theory states that all living organisms are composed of cells, which are the smallest units of structure and function, and that new cells are always the result of the division of pre-existing cells. No empirical evidence has been found to refute this theory, thus solidifying its status within the scientific community. As a critical component of biology, the cell theory aligns with the scientific definition of a theory since it incorporates all known information about the cellular basis of life and has continually withstood rigorous testing and examination.
What is a possible eDuring exercise, sensory receptors detect changes in oxygen and carbon dioxide levels in the blood. This information is then sent to the brain's medulla, which causes the heart to beat faster and increases the rate of breathing. Exercising also causes the nervous system to signal the pancreas and thyroid gland to release hormones which regulate metabolism.
Which statement is best demonstrated by this scenario?
ffect of leakage of inner ear fluid?
Answer:
Exercise is important for the body to function properly.
Explanation:
Exercise helps a person to maintain the oxygen amounts in the body. Exercise, as such, enhances and regulates almost every system of the body including the nervous, respiratory, circulatory and hormonal systems.
The sympathetic division of the autonomic nervous system controls the physical activities in a person's body by detecting the low levels of oxygen and increasing amounts of carbon dioxide in the body.
During vigorous exercise, the autonomic system increases the heart rate and breathing to meet the demand for oxygen. Sensors in the carotid arteries, aorta, and right atrium communicate with the brain to modulate these functions. Hormonal release by the pancreas and thyroid also aids in metabolic regulation.
Effects of Vigorous Exercise on the Autonomic System:
During vigorous exercise, the body undergoes several physiological changes to meet the increased demand for oxygen and nutrients by the muscles. The autonomic system plays a crucial role in regulating these changes. When cellular respiration increases, so does the level of carbon dioxide in the blood, which stimulates receptors in the carotid arteries and aorta. These receptors send impulses to the medulla oblongata, which in turn accelerates the heartbeat. Additionally, increased muscular activity leads to more blood being driven back to the right atrium, causing its distension and stimulating stretch receptors. These receptors also send signals to the medulla, contributing to the increased heart rate.
The respiratory system of the brain is activated by psychological stimuli, motor neuron activation of skeletal muscles, and proprioceptors in the muscles and joints when exercise is initiated. This leads to an immediate increase in ventilation to supply the muscles with the necessary oxygen.
Moreover, the body's response to physical exertion also involves hormonal regulation. The pancreas and thyroid gland release hormones that regulate metabolism, contributing to the body's ability to adapt and perform under stress. These changes resemble the 'fight-or-flight' response and allow the body to cope with the demands of vigorous exercise.
Sequence the levels of organization in multicellular organisms
Final answer:
The levels of organization in multicellular organisms include cells, tissues, organs, organ systems, and organisms.
Explanation:
The levels of organization in multicellular organisms are as follows:
Cells: Cells are the basic structural and functional units of living organisms. They are organized into tissues.
Tissues: Tissues are groups of cells that work together to perform a specific function. They are organized into organs.
Organs: Organs are composed of different tissues and perform specific functions in the body. They are organized into organ systems.
Organ Systems: Organ systems are groups of organs that work together to perform complex functions in the body.
Organisms: Organisms are complete living beings made up of multiple organ systems.
Corn rust is a pathogen caused by fungus that can attack corn plants and cause wide spread damage to this staple crop. Much of the midwest farmlands are used to grow corn. What method will best mitigate the impact of corn rust on this important crop?
A)Corn should only be grown in rainy season so its not needed to integrate land
B)Corn should be grown in cold season
C) Cloning
D) Genetic variation so at least some plants would be resistent to corn rust
Answer:
D
Explanation:
Answer:
D. Genetically distinct varieties of corn should be grown so that genetic variation will ensure at least some of the corn plants will be resistant to the corn rust.
Explanation:
Genetic diversity can be rare for selectively bred vegetable varieties, but it is the best method to use to ensure resistance to drought, pests, disease, and cold winters. Without genetic variation, one adverse condition could wipe out whole crop yields for a season.
fungi exist as single cells or as branching networks of multicellular filaments with a very large surface area. what is the function of the filaments?
Answer:
Their large surface area aids in nutrient absorption.
Explanation:
The main parts of a fungi's body include long, branched hair-like projections called the filaments and an outer cell wall; chitin. The hair-like projections are also referred as hyphae. A complex group of filaments or hyphae is termed as mycelium .As the filaments increase the surface area of fungi, their basic function is to absorb nutrients from external sources. Enzymes for nutrient absorption are released by the filaments on the substrate and hence the nutrients are absorbed.
The filaments which are referring to in fungi are called hyphae. The function of these hyphae is to provide a large surface area for efficient nutrient absorption and to anchor the fungus to its substrate.
What is the function of filaments?The filaments of fungi, also known as hyphae, serve a crucial function in the organism's survival. They provide a vast surface area for absorption of nutrients from the environment, allowing the fungi to obtain nutrients from a wide range of sources.
Additionally, the branching network of hyphae allows fungi to penetrate and explore their surroundings, maximizing their chances of encountering nutrient-rich substrates. This unique structure also allows for efficient exchange of gases and helps fungi to spread and reproduce.
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Which virus has a structure that includes an outer lipid bi layer that is studded with proteins?
Answer:
The envelope is an outer lipid bilayer that is studded with proteins. The function of the envelope is to identify and bind some receptor sites on the host membranes. After fusing with the cell membrane, it allows to capsid and genetic material to enter the cell and infect it.
Explanation:
a) 1. If you were cross-breeding two plants whose only difference was their scent, you would be performing a ____ cross.
Explanation:
a) 1. If you were cross-breeding two plants whose only difference was their scent, you would be performing a monohybrid cross.
The plants are physically identical, apart from alleles of one gene;thusthe cross is a monohybrid.
DNA sets contain genes that may have different forms called alleles. DNA, which is the genotype, is transcribed into mRNA and later translated into amino acids which are connected together by rRNA to form proteins which constitute the phenotype of an organism. DNA sequence mutations form new alleles, impacting the resulting mRNA, and thus the encoding protein. Within species, there may be adaptation, along with genetic drift, competitive breeding, and natural selection.
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Answer:
Monohybrid cross
Explanation:
Background:
Genes are defined as the units of heredity. Genes contain two or more alternative forms known as alleles. In terms of location, these alleles occupy a locus (place where the gene lies on chromosome) on each of the two homologous chromosomes.
Monohybrid Cross:
In heredity, a monohybrid cross is a cross between two individuals or generations that are homozygous for one gene or trait.A homozygous individual contains the same allele on both of the homologous chromosomes. This means that the individual inherited the same allele from both of the parents.This type of cross produces a heterozygous individual i.e. a hybrid in terms of only one gene or trait.For example, imagine there are two plants that are homozygous in one trait only such as flower colour. Lets assume one of them to be red AA and the other white aa.When these two are crossed i.e. AA X aa, they will produce a heterozygous genotype i.e. Aa. According to Mendel's Law of Dominance, this heterozygous individual will be red as the red trait (A) is dominant.Therefore, in terms of genetics, these plants have been compared on the basis of one trait only i.e. flower colour.What sequence of bases would pair with GTACG?
In DNA, the bases are adenine (A), cytosine (C), guanine (G), and thymine (T). A always pairs with T and C always pairs with G. Therefore, the sequence GTACG would pair with the sequence CATGC.
Explanation:The DNA bases are assigned the letters A (adenine), C (cytosine), G (guanine), and T (thymine). The base pairing in DNA is always consistent, with A pairing with T and C pairing with G.
The sequence of bases GTACG therefore pairs with the sequence CATGC. This is based on the complementary base pairing rule. Wherever G is present in the original sequence, it pairs with C in the corresponding sequence, hence the G in the first sequence pairs with the C in the second sequence. Similarly, A in the original sequence pairs with T in the second sequence.
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The sequence of bases that pairs with GTACG, considering DNA's antiparallel nature and specific base pairing, is 5'-CGTAC-3' as the complementary sequence.
To determine the sequence of bases that would pair with GTACG, we need to remember that DNA strands are antiparallel and the bases pair specifically; adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). Therefore, the complementary sequence for 5'-GTACG-3' would be 3'-CATGC-5'. Since the strands are antiparallel, when writing the complementary strand in the same 5' to 3' orientation, it would be written as 5'-CGTAC-3'.
Mitosis and meiosis 1 comparison of all phases
Answer and Explanation:
Mitosis is the type of division that occurs in the general body cells resulting in growth while meiosis is the process that occurs during the formation of sex cells. Mitosis results in two daughter that are identical to one another and to the parent cell. In meisosis there is crossing over during prophase I.
How will the student need to revise the model to demonstrate a prokaryotic cell rather than a eukaryotic cell?
Answer:
Prokaryotic cells are simple cells whereas Eukaryotic cells are large and complex cells.
Explanation:
There is difference between the prokaryotic cells and eukaryotic cells in its structure and functions. Prokaryotic cells lack well defined nucleus but contain DNA molecules called as nucleoid. whereas, Eukaryotic cell contains a well defined nucleus. Prokaryotic cell is a single-cell and contains only one chromosome whereas eukaryotic cell is a multicellular which contains many chromosomes. Features like growth, response and reproduction is present in both type of cell.COMPLETEN
Which term describes the relationship in which
one organism lives inside the other one. Check the
correct answer.
o phagocytosis
10 symbiosis
O endosymbiosis
DONE
Answer:
In biology, the relationship in which one organism lives inside another is described by the term endosymbiosis.
Explanation:
Endosymbiosis refers to a form of association that organisms have, in which one individual lives and performs his functions within another's body -using his resources to survive- being called the first symbiont, and the second host.
An example of endosymbiosis is found in bacteria that are part of the intestine of some living organisms, contributing to the process of food degradation.
Additionally, endosymbiosis is relevant in explaining the origin of eukaryotic cells from symbiosis between prokaryotic cells, which is known as endosymbiotic theory.
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Final answer:
Endosymbiosis is the relationship where one organism lives inside another; it is a type of symbiosis. An example is gut microbes producing vitamin K in humans, and it also explains the origin of mitochondria and chloroplasts in eukaryotic cells.
Explanation:
The term that describes the relationship in which one organism lives inside another is endosymbiosis. Endosymbiosis is a type of symbiosis, where organisms from two separate species live in close association with specific adaptations to each other. An example of an endosymbiotic relationship is the microbes that produce vitamin K within the human gut. These microbes benefit humans by synthesizing vitamin K, which we cannot do on our own, while they gain protection and a stable source of nutrients.
Furthermore, the theory of endosymbiosis is significant in explaining the origin of mitochondria and chloroplasts in eukaryotic cells, believed to have formed from a mutually beneficial relationship when host cells ingested aerobic bacteria and cyanobacteria but did not destroy them.
Describe how the lac operon functions and explain how it permits E. coli to produce the enzymes needed to break down lactose when it is present in the bacterium.
Answer and Explanation:
Bacteria like E.coli have devised mechanisms of survival even when conditions are harsh. This is through the production of such enzymes as B-galactosidase that enable them break down substrates like lactose in their metabolism.
For E.coli, mechanism that controls how enzyme activity is turned on or off target the genes that code for the enzymes. This system is termed as lac operon, and the enzymes that are coded for by genes which are sometimes active or inactive and depending on substrate availability are referred to as inducible enzymes.
So how does the lac operon work?
Lac operon works to regulate lactose metabolism in E.coli. An operon refers to a collection of one or more structural genes that direct synthesis of a particular enzyme.
So when lactose is present in a growth media, it acts as an Inducer hence it binds to lac oppressor (normally blocks operator). This reppressor then cannot block the operator, and RNA polymerase enzyme can proceed and bind the promoter hence transcription of the Z, Y and A genes that form the mRNA.
The mRNA in association with ribosomes initiate the synthesis of the following enzymes for lactose metabolism;
Permease, Y gene - that normally directs the entry of lactose into the cells
B-galactosidase, Z gene - that aim to break down lactose to simple units
Transacetylase, A gene - for complete lactose breakdown.
So after these events in E.coli cell, the lactose that was once available has been broken down and none is left to bind to repressor. What happens thereafter is the binding of this active repressor to the operator and thus system is shut down or more correctly, turned off.
what are nociceptors ? what is different about the 2 types of them ?
Which of the following is not an example of a naturally occurring greenhouse gas? methane,nitrous oxide ,chlorofluorocarbon or water vapor
Answer:
chlorofluorocarbon
Explanation:
The following is not an example of a naturally occurring greenhouse gas - chlorofluorocarbon
A greenhouse gasGases that produce heat in the atmosphere with the increase of concentration in the atmosphere. These gases interact with particles of pollution and are stuck in the environment and increase the contamination of the environment.
Chlorofluorocarbons (CFCs) are not naturally occurring and are produced by human activities only as byproducts of foam production, refrigeration, and air conditioning.
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Which practice could help an agrarian society prevent crops from spoiling
before they can be brought to market?
O
A. Developing irrigation techniques that conserve water
O
B. Cutting down forests to produce more cropland
O
C. Switching from gasoline-powered to electric vehicles
O
D. Creating more efficient methods of food preservation
describe what each type of survivorship show ( type1, type2 ,and type3)
Answer:
There are three types of survivorships:
Type 1: Type 1 survivorship includes organisms which have high chances of surviving through the early and middle stages of life. Their population tends to decline in the old age. For example, humans
Type 2: Type 2 survivorship contains organisms which have a constant mortality rate. The chances of an individual to die are independent of their age.For example, birds
Type 3: Type 3 survivorship includes organisms which have a rapid death rate during the early stages and only a few organisms survive till adulthood.
There are three types of survivorships:
Type 1: Type 1 survivorship includes organisms which have high chances of surviving through the early and middle stages of life. Their population tends to decline in the old age. For example, humans
Type 2: Type 2 survivorship contains organisms which have a constant mortality rate. The chances of an individual to die are independent of their age.For example, birds
Type 3: Type 3 survivorship includes organisms which have a rapid death rate during the early stages and only a few organisms survive till adulthood.
Tony Loves to swim everyday what is Tony a noun verb adjective subject
Answer:
noun
Explanation:
Tony is a person, place, or thing
Answer:
The word Tony is a noun because a noun is a person, place or thing and Tony is obviously a person
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Compare the expected mosquito birth rates in the lowlands with the rates in the mountain regions. Explain your answer
Answer:
Compare the expected mosquito birth rates in the lowlands with the rates in the mountain regions.
Mosquito breeds more at higher temperature compare to at lower temperature because the temperature on mountain is a bit lower or lesser and this slows mosquito birth rates unlike lowland area where the temperature is high, hence; this establish the fact that the higher the temperature the higher the birth rate in mosquito and the lower the temperature the lesser the birth rate in mosquito.
Explanation:
Why is freckles not X linked dominant trait
Answer:
The presence of freckles in a individual, or predisposition to have them, is a trait that is inherited with an autosomal dominant pattern, and is not related to sex-linked inheritance.
Explanation:
Freckles are accumulations of melanin in the skin, which form small reddish or light brown spots, predominantly in white-skinned people.
The melanocortin receptor gene undergoes a change that gives rise to a variant - which is phenotypically expressed in the presence of freckles - whose inheritance has been determined to be autosomal dominant.
Under no circumstances is the transmission of the gene that determines the presence of freckles linked to sex, because is an autosomal trait, as is hair, eye or skin color.
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Which molecule is split apart during the light reactions in photosynthesis?
Α. ΑΤΡ
B. Carbon dioxide
c. Water
D. Glucose
Answer:
Water molecules are split.
Explanation:
This is a tissue that makes up most of the fleshy part of a plant.
The fleshy part of the plant is shown.
Which does this tissue work with to carry out transpiration?
vascular and parenchyma tissue
dermal and vascular tissue
ground and dermal tissue
parenchyma and ground tissue
Answer:
dermal and vascular tissue
Explanation:
Xylem and phloem are the vascular tissues present in plants. The phloem tissues are involved in the transfer of food from the leaves to all part of the plant. The xylem tissue is responsible for transferring water from the roots to all parts of the plants. The dermis of the under lying side of leaves contain abundant number of stomata for the loss of water. As the water is lost, a tension is generated in the xylem tissue which causes more water to be drawn from the roots. As a result, more water keeps on losing due to transcription.
Answer:
Parenchyma and ground tissue
Which statement best explains how exposition helps a playwright develop social issues in a play?
Answer:
Exposition develops social issues by introducing conflicts and settings.
Exposition in a play provides background information that helps the audience understand and engage with the social issues being explored. It establishes the foundation for exploring the social issues and presenting conflicts and different perspectives. Without exposition, the significance of the social issues would be diminished.
Explanation:Exposition in a play refers to the introduction of background information about the characters, setting, and events. In terms of developing social issues, exposition can help a playwright by providing the necessary context for the audience to understand and engage with the social issues being explored in the play. For example, through exposition, the playwright can reveal the socio-economic status of the characters, the historical or cultural background of the setting, and the key events or incidents that contribute to the social issues being addressed.
By providing this information, exposition helps the audience to empathize with the characters and understand the social issues in a more nuanced way. It allows the playwright to establish the foundation for exploring the social issues and presenting different perspectives and conflicts. Without exposition, the audience may find it difficult to comprehend the significance of the social issues being portrayed, and the overall impact of the play in addressing those issues would be diminished.
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Which of these choices is a benefit of a circular economy?
The correct option is D. The benefit of a circular economy is “decreases environmental degradation”.
A circular economy aims to create a sustainable economic system by minimizing waste, maximizing resource efficiency, and promoting the reuse, recycling, and regeneration of materials.
This approach contrasts with the traditional linear economy, which follows a "take, make, dispose" model that leads to resource depletion and environmental harm. By prioritizing the use of renewable resources, extending product lifecycles, and closing the loop on material use, a circular economy helps reduce environmental degradation. It lowers pollution, decreases greenhouse gas emissions, and conserves natural resources.The other options are incorrect because:
Option A) Incorrect because a circular economy prioritizes using renewable resources to ensure sustainability and reduce reliance on finite resources.Option B) Incorrect because a circular economy aims to conserve resources through recycling, reusing, and regenerating materials, preventing depletion.Option C) Incorrect because a circular economy emphasizes reducing consumption by extending product lifecycles and maximizing resource efficiency.The correct question is:
Which of these choices is a benefit of a circular economy?
A. Avoids the use of renewable resources
B. Leads to resource depletion
C. Requires a high rate of consumption
D. Decreases environmental degradation
How has the study of mitosis affected scientists' knowledge of cancer?
It led to a study of how to induce cancer cells to divide more rapidly.
It led to an understanding of how cancer cells divide so rapidly.
It led to the development of contact-inhibition regulators.
It led to the discovery of how to prevent cancer cells from dividing.
Answer:
The question is asking how has the study of mitosis affected scientists’ knowledge of cancer. Mitosis is a type of cell division ( so we reject answer c, since it doesn't have to do with cell division) and what we want is to have the cells divide slower (so we reject answer a), but unfortunately, we don't know how to do it yet (so we reject answer d) - the correct answer is: It led to an understanding of how cancer cells divide so rapidly.
Answer:
The correct answer is B). It led to an understanding of how cancer cells divide so rapidly.
Explanation:
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the character having curly hair is dominant and straight hair is recessive ,why?
In genetics, curly hair is dominant over straight hair due to the interaction of alleles. The dominant allele for curly hair will 'override' the recessive allele for straight hair. We can predict genetic inheritance using tools like Punnett squares.
Explanation:The question pertains to genetic dominance, a concept in the field of genetics. Dominance in genetics is the phenomenon where one variant of a gene, called an allele, conceals the presence of a different variant at the same gene locus. For the case of hair type, naturally curly hair is dominant over straight hair because of the effect of the specific gene product, or protein, that the dominant allele produces.
In genetic terminology, we refer to having two of the same allele (for instance straight hair or 'bb') as homozygous, and having one of each (curly hair and straight hair, or 'Bb') as heterozygous. When it comes to dominant traits like curly hair, they will be visibly expressed even if only one parent gene has the dominant allele. Thus, whether an individual has the alleles 'Bb' or 'BB', they will have curly hair due to the dominance of the allele for curly hair.
Using a simple tool called a Punnett square, we are able to predict how genes will interact in producing offspring. By inputting the parental curly and straight hair alleles, it can visually show the odds of expressing a certain trait. But the fact remains that the dominant curly hair trait will be expressed over the recessive straight hair trait because of the natural workings of inheritance and genetics as determined by Mendel's law of dominance.
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Which statement best explains why organisms of the same species that become isolated eventually become different from
each other over time?
Their DNA mutates.
They are exposed to different environments.
They both find ways to survive.
They do not have any of the same genes.
Answer:
They are exposed to different environments.
Explanation:
The isolated organism should have the same gene pool. This gene pool should be maintained if there is no other factor that disrupts it.
But the condition of the habitat might be different and this will create a natural selection. The environment will give advantages to certain traits while giving disadvantages to other traits. But a different environment will support different traits, so this can create variation.
Because! They are exposed to different environments.
Species mutate to fit their environment, like a hummingbird's beak getting longer because its new environment only has deep set flowers (found that out on some animal documentary).
Which statement is accurate?
A. An allele is one form of a gene.
B. Most alleles have many genes.
C. An allele is made up of two genes.
D. A gene consists of two traits.
Answer: A). An allele is one form of a gene.
Explanation: An allele is a different form of a gene. Every trait is usually controlled by a pair of gene, each of the gene is called an allele. For instance, height is a trait and the genes that controls height can be represented as T for tall height and t for short height. T and t are alleles. Alleles can be dominant or recessive. A dominant allele is one which is able to express itself outwardly in the presence of a recessive allele while a recessive allele is one whose effect is masked by a dominant allele. A recessive allele can only express itself when it occurs in a homozygous state.