Amechanism of evolution that suggests changes in the gene pool of a population are due to chance
genetic drift
natural selection
gene flow
evolution

genetic drift

A mechanism of evolution that suggests changes in the gene pool of a population are due to chance is genetic drift. A genetic drift is a natural  phenomena  in which changes occur in allele frequencies in a population from one generation to the next generation and subsequent generations. The main reason for genetic drift is the selection of allele for the next generation a kind of sampling error. Although genetic drift can occur in populations of all sizes, it's effects are stronger in small populations. In a genetic drift a beneficial allele may be lost or a harmful allele can become fixed in a gene pool of the population purely by chance.

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.

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