The correct answer is D) The fossil record reveals intermediates that link different species. Hope this helps.
We reject the options a) and b) since the question says that the data supports "equally" both cases - so we have no basis for making a choice either way.
Further, in science the decisions are reached based on facts, not voting, so we also reject the answer D .
We are left with the answer C and this is also the best practice in science - when unsure, leave it as a hypothesis.
They allow the heart to pump more blood by decreasing the ESV.
