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. COUNT 5
QSN1 Ctenophora and the Cnidaria include what sea creatures? ANS1 anemones, corals, and jellyfish QSN2 The digestive chambers of the Ctenophora and the Cnidaria serve as what? ANS2 both the mouth and the anus QSN3 What are the 2 main germ systems in the Ctenophora and the Cnidaria called? ANS3 ectoderm and endoderm QSN4 What are the Ctenophora and the Cnidaria animals sometimes called? ANS4 diploblastic QSN5 What differentiates placozoans from the ctenophora and the cnidaria? ANS5 they do not have a permanent digestive chamber