Amino acid is to protein as
What?

amino acid is the monomer that makes up the polymer known as the protein.Hence,amino acid is the monomer of protein.

metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). the change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. i hoped i !

the correct answer is:

a population changes in response to a change in the environment.