Do all animals have a circulatory system?

11 months ago
Biology

Not all animals have a circulatory system. Poriferans, cnidarians, platyhelminthes and nematodes (in these there are the pseudocoelom fluid but no vessels) are avascular animals. Echinoderms do not have true circulatory systems either.

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Dipti KC
May 25, 2023
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