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Answer for the clue "Introduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species (as addition of the placenta in mammalian evolution) ", 12 letters:
cainogenesis

Word definitions for cainogenesis in dictionaries

WordNet Word definitions in WordNet
n. introduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species (as addition of the placenta in mammalian evolution) [syn: cenogenesis , kenogenesis , caenogenesis , kainogenesis ...

Wiktionary Word definitions in Wiktionary
n. (alternative spelling of caenogenesis English)