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Respiration in the phyla of animal kingdom

Beings from four phyla of animal kingdom “breath” through the diffusion. Explain which are those phyla? How this type of respiration is associated to the features present in those animals?

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Beings of the phyla of animal kingdom do gas exchange through the diffusion are the cnidarians, the poriferans, the nematodes (roundworms), and the platyelminthes (flatworms). Such type of respiration in these beings is possible since their cells and tissues are relatively close to the exterior.

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