Animals hollow, hollow digestive function as well as tools, marine habitat in the water as plankton and nekton, the skeleton of lime or substance referred to as animal horns diploblastik (ektodermis and endodermis). Have two forms of life stages, which can move active medusa and polyps are attached to the bottom waters settle. In the Coelenterata systematically classified into 4 classes:
a. Hidrozoa class, eg Obelia
b. Class Anthozoa, eg animals or coral reefs
c. Skypozoa class, for example: Aurelia sp (jellyfish)
d. Ctenopora class.
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