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

[Q]: Gardasil is the vaccine to prevent infection of hpv.
[A]: What is the vaccine to prevent infection of hpv?

[Q]: Some gametophytes develop underground and form mycorrhizal associations with fungi.
[A]: Some gametophytes develop underground and form mycorrhizal associations with what?

[Q]: Population is an important level of organization in ecology and the unit of microevolution.
[A]:
What is an important level of organization in ecology and the unit of microevolution?