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

statement: fish secrete a mucous covering over their exterior to help protect from predators and parasites and reduce friction with the liquid substance they live in., question: What do fish secrete over their exterior to help protect against predators and parasites?
mucous

statement: ages 12-18 is a time of significant mental, emotional, and social changes, question: When is a time of significant mental, emotional, and social changes?
ages 12-18

statement: raccoons protect their young with nests, question: What do raccoons protect their young?

nests