http://en.wikipedia.org/wiki/Animal
Among the other phyla, the Ctenophora and the Cnidaria, which includes sea anemones, corals, and jellyfish, are radially symmetric and have digestive chambers with a single opening, which serves as both the mouth and the anus.Both have distinct tissues, but they are not organized into organs.There are only two main germ layers, the ectoderm and endoderm, with only scattered cells between them. As such, these animals are sometimes called diploblastic.The tiny placozoans are similar, but they do not have a permanent digestive chamber.
Among the other phyla, the Ctenophora and the Cnidaria, which includes sea anemones, corals, and jellyfish, are radially symmetric and have digestive chambers with a single opening, which serves as both the mouth and the anus.Both have distinct tissues, but they are not organized into organs.There are only two main germ layers, the ectoderm and endoderm, with only scattered cells between them. As such, these animals are sometimes called diploblastic.The tiny placozoans are similar, but they do not have a permanent digestive chamber.
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