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Reptiles have 2 body openings. Mouth and an anus.
All cnidarians live in water, have tentacles with specialized stinging cells called nematocysts, and have an internal sac for digestion which is called the gastrovascular cavity.
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Ostium.
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The famous animal the "Porifera", has 6 body openings.
Adult echinoderms only have one body opening. Their larvae have two.
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