what is metagenesis. Mention one example which exibit this phenomenon.

The alternation of generation between the sexual and the asexual phase within the same species  is called alternation of generations. Example: Polyps 
 

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Metagenesis here is referred to the phenomenon of alternation of generation shown by cnidarians which exhibit both forms- polyps and medusae . Polyps produce medusae asexually and medusae form the polyps sexually (e.g., Obelia). Hope this information proves helpful,

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