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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 tentacle scheme organism zoology internal anatomy diagram english title schema morphology cross section Hydra Cnidaria educational material hydrozoa hydroid hypostome mesoglea ectoderma endoderma mesogloea fresh water polyp hydra vulgaris
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