Determine whether a population is evolving."Predict a phenotypic frequency when the frequency of the allele" that causes that phenotype is known. For example, if brown fur is the result of genotype "bb" and the frequency of allele "b" is known. Estimate the frequency of a recessive allele when the phenotypic frequency of the homozygote is known.

The Hardy-Weinberg law can be used to estimate these factors

Explanation:

The Hardy-Weinberg equilibrium is an equation that enables to calculate genotype frequencies from allele frequencies and thus decipher the evolutionary forces (i.e., natural selection, genetic drift, mutations, etc.) that shaped the genetic diversity of populations

i think its c. amphipod

that is wrong, its not thymus.