may have evolved from a common ancestor. all reproduce in a similar fashion. live in similar environments. should all be able to fly someday.
I gave my students this multiple choice question: The forelimb of the monkey, bat, penguin, and alligator look very different on the outside, but their skeletal structures are similar. This evidence suggests that these animals

Only one answer is correct among these 4 choices:
- may have evolved from a common ancestor.
- all reproduce in a similar fashion.
- live in similar environments.
- should all be able to fly someday.

Could you tell me which one is correct?

may have evolved from a common ancestor.