Most flatworms are without respiratory systems/organs. How do they go about gas exchange?
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In simple organisms, such as cnidarians and flatworms, every cell in the body is close to the external environment. Their cells are kept moist so that gases diffuse quickly via direct diffusion. Flatworms are small, literally flat worms, which 'breathe' through diffusion across the outer membrane.
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they exchange gas by diffusion through their outer membrane of skin
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