Question

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

Answer 1

This is an excellent example of how evolution CAN BOTH PRESERVE UNITY AND PROMOTE DIVERSITY. Unity is preserve because the molecular structure of prolactin remains constant over a long period of time and diversity is promoted because the hormonal role of prolactin has changed significantly in different animal species.