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

[EX Q]: In the lungs, oxygen diffuses out of the alveoli and into capillaries.
[EX A]: In the lungs, oxygen diffuses out of the alveoli and into where?

[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]: Integral proteins are embedded in libid bilayer.
[EX A]:
Where are integral proteins embedded?