Do all animals contain a circulatory system
Do all animals contain a circulatory system?
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Not all animals contain a circulatory system. Poriferans, platyhelminthes, cnidarians, and nematodes (in such there are pseudocoelom fluid however no vessels) are avascular animals. Echinoderms do not encompass true circulatory systems either.
Specify the valve which disparate the aorta from heart? State the significance of that valve?
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