9. Most unicellular organisms carry out respiration through simple diffusion whereas most multicellular organisms have specialized organs and mechanism to carry out respiration. Explain.
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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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The Respiratory System and Gas Exchange | Bodies and Respiration Single-celled organisms exchange gases directly across their cell membrane. Simple animals that lack specialized exchange surfaces have flattened, tubular, Sponges and jellyfish lack specialized organs for gas exchange and take in gases
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