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

[EX Q]: The height of the wave is used to determine the magnitude of an earthquake.
[EX A]: What measurement of the wave is used to determine the magnitude of an earthquake?

[EX Q]: Humans have 23 pairs pairs of chromosomes.
[EX A]: How many pairs of chromosomes do human have ?

[EX Q]: Thousands many pathogens can each droplet contain.
[EX A]:
How many pathogens can each droplet contain?