Hydra is a genus of small, fresh-water animals.
Hydra is a genus of small, fresh-water animals of the phylum Cnidaria and class Hydrozoa under the microscope for education.
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anatomyanimalsaquariumasexuallybackgroundbasalbattlebiologybodybudbuddingcellclasscnidacnidariacnidocytesdisceducationeducationalendodermaepidermisfreshwatergastrodermisgastrovasculargenushermaphroditeshydrahydroidhydrozoahydrozoanhydrozoansmacromedusamesogleamicroorganismmicroscopemicroscopymorphologynematocystnematocystsobeliaovaryphylumpolyppredatorregenerationreproductionsciencesessilesmallstickystructuresymmetrictentacleszoologyzooplankton
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