hydra body wall structure educational material for lesson zoology |
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| navigate by keyword : anatomy animal biology body capsule cnida cnidaria cnidoblast cnidocil cnidocyst cnidocyte cross diagram drawing ectoderma educational endoderma fresh hydra hydroid hydrozoa illustration internal material mesoglea mesogloea morphology nematocyst nematocyte organism polyp schema scheme section structure title vulgaris wall water zoology |
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| Hydra body wall structure. Educational material for lesson of zoology isolated on white background |
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