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

[EX Q]: Covalent solutes separate into individual molecules when dissolved.
[EX A]: Covalent solutes separate into what when dissolved?

[EX Q]: Water seeping into the ground is known as infiltration.
[EX A]: Water seeping into the ground is known as?

[EX Q]: Molds, pollen, and pet dander are examples of air pollution with biological sources.
[EX A]:
Molds, pollen, and pet dander are examples of air pollution with what type of source?