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

Ex Input:
The newest, outer layers of secondary xylem are called sapwood.

Ex Output:
What are the newest, outer layers of secondary xylem called?


Ex Input:
Municipal type of pollution comes from sewage, storm drains, septic tanks, boats, and runoff from yards.

Ex Output:
What type of pollution comes from sewage, storm drains, septic tanks, boats, and runoff from yards?


Ex Input:
Objects on earth have two forces acting on them at all times.

Ex Output:

How many forces do objects on earth have acting on them at all times?