Which of the following phyla is diploblastic?

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(A) Diploblastic animals are those in which the cells are arranged in two embryonic layers,an external ectoderm and an internal endoderm.Cnidarians (p

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Cnidaria

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(A) Diploblastic animals are those in which the cells are arranged in two embryonic layers,an external ectoderm and an internal endoderm.Cnidarians (phylum $Cnidaria$) are diploblastic.Porifera (sponges) are generally considered cellular-level organisms and are often excluded from the diploblastic/triploblastic classification,though they lack true germ layers.Platyhelminthes (flatworms) are triploblastic,meaning they possess three germ layers: ectoderm,mesoderm,and endoderm.Therefore,the correct answer is $Cnidaria$.

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