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
a. the presence of homologous structure
b. the presence of vestigial organs
c. selective breeding
d. natural selection

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

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1) the mayans built pyramids just like the egyptians. the mayans also used hieroglyphics like them.2) power was passed down by family. for example, if the father dies, the son would be the next king.3)they both built pyramids for their structures.4)the main crop for the mayans was maize.5)they also grew manioc, beans,  squash,  amaranth, and chile peppers.