Answer:
Animals in which the
cells are arranged in two embryonic layers, an external ectoderm and an
internal endoderm are called diploblastic animals (e.g., coelenterates). While
those animals in which the developing embryo has a third germinal layer, i.e.,
mesoderm lying between the ectoderm and endoderm are called triploblastic
animals, (e.g., chordates).
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