Given a fact, create a question that can be answered using the fact. Construct the question such that it is unambiguous, has a unique answer and the answer can be given using the fact.

Q: Fact: some birds live in forests

A: Some birds live in?
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Q: Fact: a bat births live young

A: Baby bats start doing what after at least a month after birth?
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Q: Fact: the mantle is located just below Earth 's crust

A:
Much iron is in?
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