They swim the same way. They eat the same food. They live in the same area of the ocean. They have similar anatomies.
I gave my students this multiple choice question: Scientists think that dolphins and whales may have evolved from a common ancestor. What evidence supports this hypothesis?

Only one answer is correct among these 4 choices:
- They swim the same way.
- They eat the same food.
- They live in the same area of the ocean.
- They have similar anatomies.

Could you tell me which one is correct?

They have similar anatomies.