Generally, if a structure pre-dates another structure in evolutionary terms, then it often appears earlier than the second in an embryo ; this general observation is sometimes summarized by the phrase " ontogeny recapitulates phylogeny ".

Generally, if a structure pre-dates another structure in evolutionary terms, then it often appears earlier than the other in an embryo ; this general observation is sometimes summarized by the phrase " ontogeny recapitulates phylogeny.

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