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.

[Q]: Abundant in unpolluted ponds and streams, planarians prey on smaller animals or feed on?
[A]: algae

[Q]: Cycloalkanes are hydrocarbons whose molecules are closed rings rather than straight or branched chains. a cyclic hydrocarbon is a hydrocarbon with a ring of these?
[A]: oxygen atoms

[Q]: What is the term for the slow wearing down of rocks on earth's surface?
[A]:
slipping