1.what is nematocyst?
2.why coelenterates are diploblastic animals?
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sorry to say but I can't understand your question
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1-Nematocyst, minute, elongated, or spherical capsule produced exclusively by members of the phylum Cnidaria (e.g., jellyfish, corals, sea anemones). ... Several such capsules occur on the body surface.
2-because they have two germ layers endoderm and ectoderm and the middle layer mesoderm is absent.
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