What characteristic is responsible for the branching off of Cnidarians from the other animals?
radial symmetry
What level of organization do they demonstrate?
tissue-level organization
How many tissue layers do these organisms have?
diploblastic (epidermis & endodermis)
What 2 body forms do these organisms demonstrate?
polyp & medusa
What is the name of the central cavity?
gastrovascular cavity
What is the name of the stinging capsule these organisms use to capture food?
nematocysts
When did this phylum show up in evolutionary histroy?
580 million years ago in Precambrian
Where is this phyla found?
freshwater and ocean
What type of digestion do they have?
Extra- and intracellular
Type of asexual reproduction
budding
What is the name of the noncellular "layer"?
Mesoglea
Type of Nervous system
nerve net