Which of the following characteristics is not associated with members of Cnidaria / Coelenterate...

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Which of the following characteristics is not associated with members of Cnidaria / Coelenterate?
(a) Alternation of generation (metagenesis between polyp and Medusa)
(b) Nematocysts, Gastrovascular cavity, extracellular + intracellular digestion
(c) Nematocyst / Cnidoblast
(d) Triploblastic forms
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