structure hydra cross section polyp educational material for lesson zoology |
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| navigate by keyword : anatomy animal biology cnidaria cross diagram drawing ectoderma educational endoderma english fresh hydra hydroid hydrozoa hypostome illustration internal material mesoglea mesogloea morphology organism polyp schema scheme section structure tentacle title vector vulgaris water zoology |
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| Structure of Hydra. Cross-section of Hydra Polyp. Educational material for lesson of zoology isolated on white background |
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