TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Temperature and ph level are important in the activity of an enzyme.

SOLUTION: Temperature and what other environmental factor are important in the activity of an enzyme?

PROBLEM: Constructive interference is when two waves combine to create a larger wave.

SOLUTION: What is it called when two waves combine to create a larger wave?

PROBLEM: Mercury is the one metal that melts below room temperature.

SOLUTION:
Name the one metal that melts below room temperature?