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

Q: Most hormones are produced by the endocrine system.

A: Most hormones are produced by which human organ system?
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Q: A hookworm is classified as a parasite.

A: A hookworm is classified as what type of organism?
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Q: Evolution process consists of the mechanisms that produce an observed pattern of change.

A:
What process consists of the mechanisms that produce an observed pattern of change?
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