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

Ex Input:
Three many families are known quarks divided into.

Ex Output:
How many families are known quarks divided into?


Ex Input:
Water affects the availability of oxygen important element in aquatic environments and in flooded soils.

Ex Output:
Water affects the availability of what important element in aquatic environments and in flooded soils?


Ex Input:
Dark matter is the area of our universe that isn't stars and galaxies called.

Ex Output:
What is the area of our universe that isn't stars and galaxies called?