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Q.

Animals classified as diploblastic belong to the following phyla: 

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a

Ctenophora and Platyhelminthes

b

None of the above

c

Cnidaria and Platyhelminthes

d

Porifera and Cnidaria

answer is A.

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Detailed Solution

Among cnidarians, the body and tentacles have two layers of tissue, the endoderm or gastrodermis, and the ectoderm or epidermis. Poriferans have a diploblastic body wall that is made up of two layers, the pinacoderm, and the ectoderm. Called pinacoderm and an inner layer, called choanoderm.

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