Search Results for: Echinoderms simply prepared
all three germ layers are well-developed, and tissues form distinct organs. the digestive chamber has two openings, a mouth and an anus, and there is also an internal body cavity called a coelom or pseudocoelom. there are exceptions to each of these characteristics, however. for instance, adult echinoderms
tract. however, in protostomes the first cavity formed during embryo development (the archenteron) develops into the mouth, and an anus forms separately. in deuterostomes, this is reversed, with the anus developing from the initial opening formed during embryo development. in most protostomes, cells simply...
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