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

Example Input: Like mitochondria, plastids contain their own dna.
Example Output: Like mitochondria, plastids contain their own what?

Example Input: A fewer predators is most likely to cause the number of rabbits living in an area to increase.
Example Output: Which factor is most likely to cause the number of rabbits living in an area to increase?

Example Input: The major entrance and exit for the respiratory system is nose facial orifice.
Example Output:
The major entrance and exit for the respiratory system is which facial orifice?