What are the definitions for gene pool and allele frequency? A. the alleles for a species, the number of times a gene appears
B. the number of alleles: genes that appear in a population
C. all the alleles that appear in a population: the number of times the alleles appear
D. all the genes that are present in a population; the number of times an allele occurs in a gene pool

Allele frequency- the percentage with which a specific allele is found in a population. Gene Pool- the sum total of all alleles present in all populations of a particular species. ... evolution involved a change in allele frequency in a population's gene pool over a number of generations.

Explanation:

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frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.