Given a statement and question, generate the answer to the question such that the answer is contained in the statement.

[Q]: statement: certain therapsids became more mammal-like as they grew., question: What did therapsids become as they grew?
[A]: mammal

[Q]: statement: The genitalia are used when having offspring., question: The genitalia are used when having what?
[A]: offspring

[Q]: statement: respiration requires a certain amount of carbon dioxide, question: What does respiration require?
[A]:
carbon dioxide