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

Ex Input:
Carried through body happens if cancer cells enter the blood stream.

Ex Output:
What happens if cancer cells enter the blood stream?


Ex Input:
Terrestrial biomes are associated with land, while aquatic ones are associated with water.

Ex Output:
Terrestrial biomes are associated with land, while aquatic ones are associated with what?


Ex Input:
There are six types types of simple machines.

Ex Output:
How many types of simple machines are there?