Which of the following are triploblastic?

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Roundworms

Sponges

Corals

Comb jellies

answer is C.

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Detailed Solution

Roundworms (phylum Aschelminthes) are triploblastic and possess three embryonic germ layers: ectoderm, mesoderm and endoderm. Sponges, corals and comb jellies are diploblastic. In these animals, the cells are arranged in two embryonic layers, an external ectoderm and an internal endoderm.

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