The species are both herbivores. The species have similar bone structure. The species live in the same environment. The species both obtain oxygen from the air.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following observations best supports the conclusion that two animal species evolved from a common ancestor in recent geological history?
Possibilities:
- The species are both herbivores.
- The species have similar bone structure.
- The species live in the same environment.
- The species both obtain oxygen from the air.

The species have similar bone structure.