表皮
amoeboid motion
anatomy
animal
asexual
background
basal disc
biologists
biology
bud
budding
bulbs
cavity
cell
cnidaria
cnidarian
cnidocytes
digestion
education
feeding
gastrodermis
green
hermaphrodites
hydra
hydrozoa
hydrozoans
laboratory
magnification
medusa
microbiology
microorganism
microscopic
microscopy
nematocyst
nematocysts
organism
ovary
polyp
predator
radially
regeneration
reproduction
science
sedentary
sessile
slide
sticky
structure
symmetric
tentacles
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