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

[EX Q]: Municipal type of pollution comes from sewage, storm drains, septic tanks, boats, and runoff from yards.
[EX A]: What type of pollution comes from sewage, storm drains, septic tanks, boats, and runoff from yards?

[EX Q]: The main advantage of urea is its very low toxicity.
[EX A]: The main advantage of urea is its very low what?

[EX Q]: Lab experiments is most evidence gathered in science.
[EX A]:
How is most evidence gathered in science?