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

Q: Photoautotrophs and chemoautotrophs are two basic types of autotrophs.

A: Photoautotrophs and chemoautotrophs are two basic types of what?
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Q: Stimulation of triglyceride breakdown is the first direct action of growth hormone.

A: What is the first direct action of growth hormone?
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Q: The lens of the eye is a(n) convex shape.

A:
What shape is the lens of the eye?
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