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

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: Trichomoniasis is cause by a protozoa.
Example Output: Trichomoniasis is cause by what type of pathogen?

Example Input: The two parathyroid glands are located behind the thyroid gland.
Example Output:
The two parathyroid glands are located behind what gland?