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.

Input: Consider Input: What term is used to describe anything that takes up space and has mass?

Output: size

Input: Consider Input: Which vertebrae carry the greatest amount of body weight and are thus characterized by the large size and thickness of the vertebral body?

Output: artery vertebrae

Input: Consider Input: Ion pumps, the biological machines responsible for the selective transport of metal ions, are complex assemblies of what?
Output: cells