Life: The Science of Biology 11th Edition

Published by W. H. Freeman
ISBN 10: 1-31901-016-4
ISBN 13: 978-1-31901-016-4

Chapter 30 - Animal Origins and the Evolution of Body Plans - 30.1 - Some animal Characteristics Evolved More Than Once - 30.1 Recap - Learning Outcomes - Page 640: 2

Answer

Diploblastic animals have two germ layers: an endoderm and an ectoderm. Triploblastic animals have the same two germ layers, plus a mesoderm in between. Diploblastic organisms (cnidarians like jellyfish and anemone) are considered less advanced than triploblastic animals, which include anything from flatworms to apes.

Work Step by Step

Diploblastic animals have two germ layers: an endoderm and an ectoderm. Triploblastic animals have the same two germ layers, plus a mesoderm in between. Diploblastic organisms (cnidarians like jellyfish and anemone) are considered less advanced than triploblastic animals, which include anything from flatworms to apes.
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