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

[EX Q]: Pyramid ecosystem is used to show energy flow through the trophic levels.
[EX A]: What is used to show energy flow through the trophic levels?

[EX Q]: Population is an important level of organization in ecology and the unit of microevolution.
[EX A]: What is an important level of organization in ecology and the unit of microevolution?

[EX Q]: Stimulation of triglyceride breakdown is the first direct action of growth hormone.
[EX A]:
What is the first direct action of growth hormone?