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

[EX Q]: statement: some predecessors became more mammal-like as they continued to evolve, question: What did some predecessors become as they continued to evolve?
[EX A]: mammal-like

[EX Q]: statement: Daily exercise requires a lot of calories., question: What does daily exercise require?
[EX A]: calories

[EX Q]: statement: signals are detected by the optic nerve, question: What type of nerve detects signals?
[EX A]:
optic nerve