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

[Q]: Control rods play an important role in the modulation of the nuclear chain reaction.
[A]: What play an important role in the modulation of the nuclear chain reaction?


[Q]: Virtually all aquatic organisms depend directly or indirectly on protists for food.
[A]: Virtually all aquatic organisms depend directly or indirectly on what for food?


[Q]: Decibel is the term used to measure the intensity of sound waves.
[A]:
What is the term used to measure the intensity of sound waves?