TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Cells are small biological structures that make up all living things, including the human body.

SOLUTION: What small biological structures make up all living things, including the human body?

PROBLEM: Most protein antigens require signals from helper t cells (th2) to proceed to make antibody.

SOLUTION: Most protein antigens require signals from helper t cells (th2) to proceed to make what?

PROBLEM: Comet tails always point away from the sun instead of trailing behind the comet because dust particles recoil.

SOLUTION:
Why do comet tails always point away from the sun instead of trailing behind the comet?