Animal P always breathes through gills. Animal Q breathes both through moist skin and lungs. Animal R breathes only through its moist skin and animal S breathes through its cell membrane. Which one of these animals could be Amoeba?

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Solution

The correct option is D S
Animal P always breathes through gills - fish; animal Q breathes both through moist skin and lungs - frog; animal R breathes only through its moist skin - earthworm; animal S breathes through its cell membrane - amoeba. Oxygen diffuses in and carbon dioxide diffuses out of its cell membrane.
Therefore, the correct answer is option D.

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