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

[EX Q]: Muscle type of cell function relies on microfilaments, which are the actin components of the cytoskeleton.
[EX A]: What type of cell function relies on microfilaments, which are the actin components of the cytoskeleton?

[EX Q]: Poles parts of the planet does solar energy have difficulty reaching.
[EX A]: What parts of the planet does solar energy have difficulty reaching?

[EX Q]: Polar climates include polar and alpine other kind of tundra.
[EX A]:
Polar climates include polar and which other kind of tundra?