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]: Why is the root cap continuously replaced in plants?
[A]: due to growth

[Q]: Robert merrifield developed the first synthetic approach for making what essential cell substances in the lab?
[A]: cells

[Q]: Most thoracic vertebrae have two facets that articulate with the head of what structure?
[A]:
calf