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

Q: Catalyst gets poisoned happens if a molecule forms strong bonds to the catalyst.

A: What happens if a molecule forms strong bonds to the catalyst?
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Q: Incubation is when birds keep their eggs warm while the embryos inside develop.

A: What is it called when birds keep their eggs warm while the embryos inside develop?
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Q: Passive transport requires no energy and occurs when substances move from areas of higher to lower concentration.

A:
What type of transport requires no energy and occurs when substances move from areas of higher to lower concentration?
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