The two body forms of some Radiata is an example of alternation of generations.

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The two body forms of some Radiata (polyp and medusa) represent different stages in their life cycle, but this is not considered alternation of generations. Alternation of generations refers to the occurrence of both sexual and asexual reproductive phases in an organism's life cycle, typically seen in plants and some algae, not the different morphological stages seen in Radiata.

The Two Body Forms of Some Radiata Is an Example