they breathe through there skin
Oxygen dissolves on the mucus of their skin and goes into their cardiovascular system. And since it goes through the mucus of their skin they have to stay moist.
Through their butts.
Earthworms do not have respiratory systems. They exchange oxygen through their skin.
the worm especially earthworms
Red Blood cells help you get oxygen to your cells
Cells that do not get oxygen will die.
Earthworms respire and take in oxygen directly from the skin and releases co2 from the skin as well.It has no vascular system so it gets all it's oxygen through diffusion through it's skin if that's what you mean. In other terms its individual cells respire just as any other animal cells would.
New cells grow on their ends causing work to get longer
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Red blood cells carry oxygen around the body and to the cells.
Hydra cells get oxygen through diffusion.
blood carry oxygen to cells