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

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: Ecological pyramids can demonstrate the decrease in energy, biomass or numbers within an ecosystem.
Example Output: What can demonstrate the decrease in energy, biomass or numbers within an ecosystem?

Example Input: Bacteria is usually the prey of a protist.
Example Output:
What is usually the prey of a protist?