Given a scientific passage and an answer, generate a question for the given answer.
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Question: Passage: Amphibians have permeable skin that easily absorbs substances from the environment. This may explain why they seem to be especially sensitive to pollution. Monitoring the health and survival of amphibians may help people detect pollution early, before other organisms are affected. Answer: amphibians

Answer: What group of animals has permeable skin that makes them vulnerable to pollution?

Question: Passage: The three types of muscles in the body include skeletal muscle, smooth muscle, and cardiac muscle. Answer: muscle

Answer: Smooth, cardiac, and skeletal are all types of what?

Question: Passage: Most organelles are common to both animal and plant cells. However, plant cells also have features that animal cells do not have: a cell wall, a large central vacuole, and plastids such as chloroplasts. Answer: plant cells

Answer:
Would you find cells that contain a cell wall, a large central vacuole, and plastids in plant or animal cells?