Ancestors of the koala lived on the ground, but modern koalas live in trees and eat eucalyptus leaves, which are poisonous to most other animals. The difference between the ancestor and modern koala was caused by.....

AThe presence of homologous structure
BThe presence of vestigial organs
CSelective breeding
DNatural selection

Verified Answer :

I think the answer is (A), because their homologous structure would allow them to hang onto the trees.

The answer is (A) bc the Homologous would allow them