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

Q: Some gametophytes develop underground and form mycorrhizal associations with fungi.

A: Some gametophytes develop underground and form mycorrhizal associations with what?
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Q: The location of an object in a frame of reference is called position.

A: The location of an object in a frame of reference is called what?
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Q: You call the movement of molecules across a membrane without the input of energy passive transport.

A:
What do you call the movement of molecules across a membrane without the input of energy?
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