Animal kingdom-breath by the diffusion
Beings from four phyla of animal kingdom “breath” (do gas exchange) by the diffusion. Which are such phyla? How is this kind of respiration related to features existed in such animals?
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The phyla of animal kingdom whose beings do gas exchange by the diffusion are poriferans, cnidarians, platyelminthes (or flatworms) and the nematodes (that is, roundworms). This kind of respiration in such beings is possible as their tissues and cells are relatively close to the exterior.
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