When you get cut, your skin cells release hormones that signal platelets to come and stop the bleeding. Platelets then release more hormones that signal even more platelets to help stop bleeding. The hormone signals continue until the cut is closed. Explain WHY this is a positive feedback loop.

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Explanation:

The process of blood clotting is a positive feedback loop because it is a process that needs to go into completion, unlike in negative feedback loops in which the initial status quo (the setpoint) needs to be returned to.

In positive feedback loops, when the system senses a change from normal, the control center increases this change until the initial process that triggered the change goes to completion.

The bleeding in a cut skin needs to be stopped, hence, the control center will signal the effector to keep releasing hormones for more platelets to be formed until the bleeding subsides. Hence, the process is a positive feedback loop.

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation:

regents of the university of california v. bakke, 438 u.s. 265 (1978), was a landmark decision by the supreme court of the united states. it upheld affirmative action, allowing race to be one of several factors in college admission policy.