How can algal blooms be

Numerous earthquakes occur at the San Andreas fault because it:

bija089 [108]

Answer:

D

Explanation:

because my test said so.

7 0

3 years ago

Stem cells found adult tissue such as in bone marrow brain muscle skin and liver are only capable of what

mafiozo [28]

The correct answer is self-renewal.

The hemopoietic stem cells, found in the red bone marrow, is a usual example of adults stem cells. These stem cells, divide into different kind of blood cells. The bone marrow also comprises a second kind of adult stem cell called mesenchymal or stromal stem cell. The adult stem cells have also been witnessed in various other kinds of tissues like skeletal muscle, brain, skin, blood vessels, heart, and the teeth.

These adult stem cells possess the tendency to differentiate into other kinds of cells, and can also differentiate in self-renewal to generate more of the similar kind of stem cells.

Self-renewal refers to the procedure by which the differentiation of stem cells takes place to produce more stem cells, continuing the pool of stem cells all through the life. Self-renewal is considered as the differentiation with the sustenance of the undifferentiated state.

5 0

4 years ago

PLEASEEE HELLPPP PLEASEE SOMEONE ANSWERR THISSS PLEASEEEEEEEEEE

vichka [17]

1) Natural Selection- General speaking, something must cause differential reproduction and then better suited individuals will survive over time.

- Detailed Explanation -

Natural selection is the process in which individuals whom are better suited to their environment will have an increase in fitness. It occurs over multiple generations and can take a very long period of time to occur.

For natural selection to occur, the following must be true:

1. There must be variation in traits (every individual can't be identical)

2. There must be differential reproduction (some individuals are more likely to reproduce than others)

3. Traits are passed on from generation to generation

Thus, the first step in natural selection is that something must cause differential reproduction. This could be the introduction of a predator, a disease, a random mutation that is detrimental, a change in resource availability such as a drought, and so forth.

This image shows how a genetic mutation is unfavorable and is selected against, but the same process holds for a gene that is unfavorable during any scenario.

This event causes some individuals to survive and reproduce and some to be less successful. For example, a predator is introduced and it hunts and kills mostly individuals with shorter legs that run slowly. Or the environment undergoes a long drought and individuals in the species who have a gene that helps them perspire (sweat) less are more successful.

Over multiple generations, the genetic composition of the species changes. Maybe within six generations the predator has completely wiped out individuals with shorter legs. Maybe within two generations the drought completely eliminates individuals with a gene that results in excess perspiration. The amount of time will vary.

2) Mutation - A change in the genetic structure of an organism.

Explanation:

Usually, a mutation has to be expressed as some macro-functional characteristic although some may be hidden in internal systems.

3) Genetic Drift- Genetic drift is the change in the frequency of an existing allele in a population due to random sampling of organisms.

Explanation:

The effect of genetic drift is larger when there are few copies of an allele, whereas when there are many copies the effect is smaller.

Genetic drift describes random fluctuations in the number of gene variants in a population. Once it begins, genetic drift will continue until the involved allele is either lost by a population or until it is the only allele present in a population at a particular locus. Both possibilities reduce the genetic diversity of a population.

Genetic drift can cause a new population to be genetically distinct from its original population, which has led to the hypothesis that it plays a role in the evolution of new species.

4) Gene Flow- Gene flow is a concept in population genetics to refer to the movement of genes or alleles between interbreeding populations of a particular species.

Explanation:

Gene flow is an important mechanism for transferring genetic diversity among populations. Migrants into and out of a population may result in a change in allele frequencies, thus changing the distribution of genetic diversity within the populations. High rates of gene flow can reduce the genetic differentiation between the two groups, increasing homogeneity.

It is thought that gene flow constrains speciation by combining the gene pools of the groups and thus, prevents the development of differences in genetic variations that would have led to full speciation. It is expected to be lower in species that have low dispersal or mobility, occur in fragmented habitats, there is a long distance between populations, and smaller population sizes.

It includes different kinds of events, such as pollen being blown to a new destination or people moving to new cities or countries. However, there are certain factors that serve as barriers to gene flow. Some of the factors affecting the rate of gene flow include physical barriers, geological events and geographical barriers.

5)Non Random mating- The nonrandom mating is a selective pattern.

Explanation:

The nonrandom pattern of mating is an assortative pattern of sexual reproduction. During the reproduction, similar phenotypes are selected for mating. It is a random process. It is also known as positive assortative mating.

7 0

3 years ago

Which statement best describes cancer cells?

Anvisha [2.4K]

The answer is (They are not regulated by contact inhibition.) Contact inhibition is the inhibition or the stopping of the movement and division of cells from rapidly and uncontrollably dividing.

7 0

3 years ago

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Which statement is one of fact supporting how pH and flower color are related?

Goshia [24]

Yes, pH of the soil affects the colour of flower.

Flowering plants grown in acidic soil (pH<7) bears blue flowers or at has a blueish tint.

Whereas, Flowering plants grown in Neutral (pH=7) and Basic (pH>7) soil bears pink and red flowers.

A plant's flower color is determined by a complex balance between chlorophyll, beta carotene, flavonoids,etc in particular pH of the soil to give out vibrant colors like red, blue, pink, yellow,etc.

7 0

4 years ago

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