Why do earthworms have moist skin?
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The earthworm has no lungs and takes in oxygen through its moist skin - it is a skin breather. Oxygen from the air dissolves in the moisture on the worms skin and then travels into the skin blood. If it dries out it will suffocate. Its skin is covered by mucus-secreting cells. The mucus serves not only in respiratory exchange, but it also lubricates the worm's body and eases passage through the burrow.
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