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Q.
Most appropriate term to designate the life-cycle of Obelia is
Animal Kingdom
Solution:
Most appropriate term to describe the life cycle of Obelia is metagenesis. It is a life cycle alternating between a generation reproducing sexually and another reproducing asexually, the two often differing morphologically. Metagenesis is a special type of polymorphism in which the sexual zooids become separated from the parental colony. Metagenesis is evident in the life cycle of Obelia.