Structure of Hydra. Cross-section of Hydra Polyp. Educational material for lesson of zoology premium vector by mariaflaya

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vector illustration animal structure drawing biology capsule tentacle scheme organism zoology internal anatomy diagram schema morphology cross section Hydra Cnidaria educational material hydrozoa hydroid hypostome cnidocyte cnida nematocyst cnidocyst cnidocil cnidoblast nematocyte mesoglea ectoderma endoderma mesogloea fresh water polyp hydra vulgaris

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