The respiratory system of the worm is much different from that of a human. Worms breathe through tiny mucus-secreting cells on the surface of their skin. Therefore, their skin needs to be very moist in order for them to survive – otherwise, they would dry out. When it rains, the ground is moist enough for the worms to travel upon, so many worms take advantage of that situation in order to move around freely, or locate a mate.
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