why is the respiratory surface of earthworm is its skin?
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because absence of respiratory organs..and network of capillaries lying just under the body surface...so.. diffusion takes place easily..
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Earthworms do not have specialized respiratory organs like we do; instead, they take in oxygen and expel carbon dioxide directly through their skin. Oxygen diffuses through the earthworm's body surface and diffuses inward to the network of capillaries lying just under the body surface.
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