Why is it earthworm only depends on its skin surface for gas exchange?
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Answer: The worm's skin is protected by a thin cuticle and kept moist by a slimy mucus. This lets it absorb the oxygen it needs and expel carbon dioxide. If a worm is dried up by the sun, it will die because the exchange of gases can't take place. ... Air contains more oxygen than water does, and remember, earthworms need oxygen.
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Because humans have lungs for air
In the same way earth worms depend on its skin for the gas exchange. Like frogs
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