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B
Cnidaria and Platyhelminthes
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C
Ctenophora and Platyhelminthes
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D
None of the above
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Solution
The correct option is A Porifera and Cnidaria Cnidarians are diploblastic meaning the body and the tentacles consist of two cell layers, the endoderm or gastrodermis and the ectoderm or epidermis. Body wall of poriferans is diploblastic, which consists of an outer layer called as pinacoderm and an inner layer, called as choanoderm.