Question

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.....

A. The presence of homologous structure
B. The presence of vestigial organs
C. Selective breeding
D. Natural selection

Answer 1

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

Answer 2

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