In a newt, which life-cycle stage has lungs?

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Explore the Academic Decathlon Science Test. Practice with quizzes and in-depth explanations to boost your exam readiness and improve your scores.

Multiple Choice

In a newt, which life-cycle stage has lungs?

Explanation:
In a newt, respiration shifts from water to air as it matures. The larval stage lives underwater and uses gills (and often skin) to exchange gases, while the adult undergoes metamorphosis and develops lungs to breathe air and usually grows legs. Eggs do not have lungs, and the larval stage doesn’t rely on lungs either, so the lungs appear in the adult stage.

In a newt, respiration shifts from water to air as it matures. The larval stage lives underwater and uses gills (and often skin) to exchange gases, while the adult undergoes metamorphosis and develops lungs to breathe air and usually grows legs. Eggs do not have lungs, and the larval stage doesn’t rely on lungs either, so the lungs appear in the adult stage.

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