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I always thought they went on the surface because they were drowning.

• he_is_legend 4y ago
  As the article states: earthworms breathe through their skin; require moisture for this process; and do not have lungs that can fill with water.
  • Volundr 4y ago
    In fact I have a home built aquaponics system and have worms in the grow beds. Because the oxygen content of the water stays pretty high, the earthworms do just fine submerged at all times.