Question

what is coelenterata

Answer 1

The term “Coelenterata” signifies the presence of a single internal cavity called coelenteron, or gastrovascular cavity, combining functions of both digestive and body cavities. - The term “Cnidaria” indicates the presence of stinging cells (Gr., knide = nittle or stinging cells).

Answer 2

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Coelenterata is an obsolete term encompassing the animal phyla Cnidaria (coral animals, true jellies, sea anemones, sea pens, and their allies) and Ctenophora (comb jellies). The name comes from the Greek "koilos" ("hollow") and "enteron" ("intestine"), referring to the hollow body cavity common to these two phyla.[1][2] They have very simple tissue organization, with only two layers of cells (external and internal), and radial symmetry. Some examples are corals, which are typically colonial, and hydra, jelly fish and sea anemones which are solitary. Coelenterata lack a specialized circulatory system relying instead on diffusion across the tissue layers.

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