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

Example Input: Bacteria may divide several times an hour.
Example Output: Bacteria may divide several what an hour?

Example Input: Embryos usually don't survive if they have extra or too few of these genetic units?
Example Output: Embryos usually don't survive if they have extra or too few of these genetic units?

Example Input: Troposphere part of the atmosphere do greenhouse gasses trap heat in.
Example Output:
Which part of the atmosphere do greenhouse gasses trap heat in?