Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
--------
Question: Together, the muscular and skeletal organs are known as the musculoskeletal system.

Answer: Together, the muscular and skeletal organs are known as what?

Question: Water affects the availability of oxygen important element in aquatic environments and in flooded soils.

Answer: Water affects the availability of what important element in aquatic environments and in flooded soils?

Question: Chemicals do microbes use to make food.

Answer:
What do microbes use to make food?