Final answer:
Amphibians use gills for breathing in early life and skin as a respiratory organ, with a dense network of capillaries facilitating gas exchange.
Explanation:
Amphibians utilize gills for breathing early in life, and develop primitive lungs in their adult life; additionally, they are able to breathe through their skin. Earthworms and amphibians use their skin as a respiratory organ, with a dense network of capillaries facilitating gas exchange.
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