Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Q: The majority of arthropods live on land.

A: Where do the majority of arthropods live?
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Q: Carried through body happens if cancer cells enter the blood stream.

A: What happens if cancer cells enter the blood stream?
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Q: The male reproductive system consists of structures that produce sperm and secrete testosterone.

A:
What does the male reproductive system consist of?
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