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

Q: Interphase is when DNA is copied.

A: When DNA is copied?
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Q: Ejaculation is semen passing out of the body through the penis.

A: Ejaculation is semen passing out of the body through what?
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Q: bone density decreases when osteoclasts are more active than osteoblasts

A:
What is more active than osteoblasts?
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