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]: In gas exchange, oxygen flows into the blood, and what flows out?
[A]: naturally dioxide

[Q]: Tropical rainforest, chaparral, and taiga are what kind of biomes?
[A]: endangered

[Q]: The type of what dictates how far it can penetrate into matter, such as lead or human flesh?
[A]:
insulation