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

[EX Q]: statement: Weather refers to the conditions of a layer of gases around a planet, question: What refers to the conditions of a layer of gases around a planet?
[EX A]: Weather

[EX Q]: statement: research are often done in a laboratory., question: In what laboratory is research often done?
[EX A]: laboratory

[EX Q]: statement: Eggs are often laid by birds in lifeless trees., question: Eggs are often laid by birds in what?
[EX A]:
lifeless trees