TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: A student should use a balance to compare the masses of two small rocks.

SOLUTION: Which tool should a student use to compare the masses of two small rocks?

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

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

PROBLEM: Water makes up most of  biological tissues.

SOLUTION:
What makes up most of  biological tissues?