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

Stimulation of triglyceride breakdown is the first direct action of growth hormone.
What is the first direct action of growth hormone?

Destructive interference in waves occurs two troughs what things overlap.
Destructive interference in waves occurs when what things overlap?

Decreases happens to a cell's efficiency as it grows in size.
What happens to a cell's efficiency as it grows in size?