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

Example Input: Water affects the availability of oxygen important element in aquatic environments and in flooded soils.
Example Output: Water affects the availability of what important element in aquatic environments and in flooded soils?

Example Input: Plant nutrition is the study of the chemical elements necessary for plant growth.
Example Output: What is the study of the chemical elements necessary for plant growth called?

Example Input: A change of season and less food usually cause certain animals to migrate.
Example Output:
Which two environmental changes usually cause certain animals to migrate?