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

[Q]: Prokaryotes group of simple organisms recycles nutrients and has been on earth since long before multicellular life appeared.
[A]: What group of simple organisms recycles nutrients and has been on earth since long before multicellular life appeared?

[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]: Red, orange colors in a neon sign represent real neon.
[A]:
What colors in a neon sign represent real neon?