How Earthworms Breathe


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Even though earthworms need to breathe, they have no lungs.  They acquire oxygen through their skin.  This is why earthworms surface after heavy rains, despite the fact that it is extremely hazardous for them to do so.  If they don’t surface, they will suffocate and die because the heavy water content of the soil after rain doesn’t allow gases to diffuse across their skin.

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