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Hydra is a multicellular animal with tissue level of organization but has no organs. It has a large surface area in relation to its volume. Being diploblastic, it has two layers of cells in its body. As most of its cells are in direct contact with water, the ectodermal cells exchange gases with external water while endodermal cells with water that comes within the gastro-vascular cavity.

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Q: What is the respiratory organ of hydra?
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