Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
--------
Question: Some gametophytes develop underground and form mycorrhizal associations with fungi.

Answer: Some gametophytes develop underground and form mycorrhizal associations with what?


Question: Wave amplitude and wavelength are two important measures of wave size.

Answer: Wave amplitude and wavelength are two important measures of what?


Question: It would help conserve water to turn off water while brushing teeth.

Answer:
Which would help conserve water?