Prolactin Is a Hormone Whose Molecular Structure Has Remained Stable

Prolactin is a hormone whose molecular structure has remained stable over evolutionary time,but whose hormonal role has changed dramatically in different animal species.This is an excellent example of how evolution

A) can both preserve unity and promote diversity.
B) is responsible for mutation in vertebrates.
C) has stayed within narrow boundaries in regard to regulation of homeostasis.
D) occurs rapidly at the molecular level to keep up with changing environmental influences.