organization of tissues but no complex organs are present
two body forms present in Cnidarians
umbrella-like free swimming stage and a attached/stationary form
surronded the only opening to the central cavity
used for feeding and a certain type of locomotion
how many definite tissue layers do hydras have?
what embroynic layers would you guess give rise to the tissue layers of this animal's body?
where extra cellular digestion begins
line the cavity
where food particles are drawn in
where intracellular digestion occurs
unique cells to Cnidarians
contain a stinging organelle called a nematocyst
a stinging organelle that comes out of a cnidocytes
trap food or sting predators