Given a scientific question, generate an incorrect answer to the given question. The incorrect answer should be a plausible alternative to the correct answer. The answer should be some other item belonging to the same category as the correct answer but should be incorrect.

[EX Q]: Pollutants in surface water can filter into the ground and enter a what?
[EX A]: hydro plant

[EX Q]: Because it produces oxygen, what plant process was necessary for the evolution of animals?
[EX A]: germination

[EX Q]: The surfaces of the bones at the joints are covered with a smooth layer of cartilage, which reduces what force between the bones when they move?
[EX A]:
vibration