Both are tall. Both run fast. They have the same diet. They have the same bones in their limbs.
I gave my students this multiple choice question: According to scientists, donkeys and horses share a common ancestor. Which evidence shows that the two organisms are related?

Only one answer is correct among these 4 choices:
- Both are tall.
- Both run fast.
- They have the same diet.
- They have the same bones in their limbs.

Could you tell me which one is correct?

They have the same bones in their limbs.