Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: Sexually do invertebrates reproduce.

Answer: How do invertebrates reproduce?

Question: Age causes reduction of elasticity in all organs.

Answer: What causes reduction of elasticity in all organs?

Question: Hookworms infest the intestines.

Answer:
What part of the body do hookworms infest?