How do the germ layers of Radiata and the other Eumetazoa differ?
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Eumetazoa, depending on whether they show radial or bilateral symmetry have either two germ layers or three germ layers. Those animals with radial symmetry have two layers, ectoderm and endoderm. Those with bilateral symmetry have the same two layers plus a third, the mesoderm.
Germ layers are the original cells for all tissues.
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