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.
--------
Question: Internal metabolism and the external environment are the sources of heat for what?

Answer: hemeostasis

Question: What single-celled organism can be either a predator, decomposer, herbivore, or parasite in the food chain?

Answer: vertebrates

Question: What globular protein is used in the construction of the hollow tube?

Answer:
actin