What is circulation, Biology

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Q. What is circulation?

Circulation is the movement of substances like gases within blood vessels and nutrients and cavities throughout the organism.

Q. Do all animals have a circulatory system?

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


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