Hydra is a genus of small, fresh-water animals of the phylum Cnidaria and class Hydrozoa.

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animal biology black bright budding cell cellular cnidaria colorful drawing eumetazoa freshwater green hydra hydridae hydroid hydrozoa invertebrate macro magnification micro microbiology microorganism microscope microscopic microscopical microscopy multicellular museum organism permanent slide plate plate pond predator regeneration reproduce reproduction saturated saturation science slide slide plate small tentacles tiny water white wildlife
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