Discuss the phylum Cnidaria. What are the basic body forms?

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Discuss the phylum Cnidaria. What are the basic body forms? Also, state the type of symmetry present and if these organisms have tissues and organs (and if present, state the number of tissues and organs). How do these feed? Be specific about what is used to feed, and state the type of digestive tract that is present. Lastly, give three example organisms in this group