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Answer for the clue "The alternation of two or more different forms in the life cycle of a plant or animal ", 13 letters:
heterogenesis

Word definitions for heterogenesis in dictionaries

Wiktionary Word definitions in Wiktionary
n. 1 (context biology English) abnormal organic development. 2 (context biology English) The birth of a living being from a parent of a different kind; having two different forms in the life cycle.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Heterogenesis \Het`er*o*gen"e*sis\, n. [Hetero- + genesis.] (Biol.) Spontaneous generation, so called. (Biol.) That method of reproduction in which the successive generations differ from each other, the parent organism producing offspring different in habit ...

WordNet Word definitions in WordNet
n. the alternation of two or more different forms in the life cycle of a plant or animal [syn: alternation of generations , xenogenesis ]