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

[Q]: The amniotic egg first evolved in reptiles.
[A]: The amniotic egg first evolved in what species?


[Q]: Carried through body happens if cancer cells enter the blood stream.
[A]: What happens if cancer cells enter the blood stream?


[Q]: Water affects the availability of oxygen important element in aquatic environments and in flooded soils.
[A]:
Water affects the availability of what important element in aquatic environments and in flooded soils?