TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: The long, threadlike extensions of the nerve cell help transmit nerve impulses.

SOLUTION: Which part of the nerve cell helps transmit nerve impulses?

PROBLEM: All enzymes have an optimal temperature and ph.

SOLUTION: All enzymes have an optimal temperature and what?

PROBLEM: Solar energy travels in photons.

SOLUTION:
Solar energy travels in what?