Which of the following is least likely to change the gene pool of a population of chipmunks? A pesticide poisons and kills a large number of chipmunks.
A group of chipmunks moves to a new habitat.
A number of chipmunks die due to old age.
A genetic mutation causes some of the chipmunks to have larger eyes.

A number of chipmunks die due to old age.

Explanation:

A mutation is any genetic change in the genome of an organism. When a mutation occurs in germline cells it may be passed from one generation to the next, thereby changing the gene pool in a population. Moreover, gene flow is the transference of genetic material among populations, which also have the potential to modify the gene pool in a population. Gene flow may be caused by the movement (migration) of individuals from one population to another and further reproduction of these organisms. Both mutations (i.e., germline mutations) and gene flow (i.e., migration) are evolutionary forces capable of changing the gene pool composition of a population. On the other hand, a pesticide that causes the death of many individuals may also potentially alter the gene pool in a population. Finally, old individuals that death by age are not expected to modify the gene pool of a population (since these organisms don't reproduce).

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.