"Ontogeny recapitulates phylogeny" means that

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"Ontogeny recapitulates phylogeny" is a phrase coined by Ernst Haeckel in the late 19th century which suggests that the development of an organism (ontogeny) expresses the evolutionary history of that organism's species (phylogeny). In other words, the stages of development that an individual goes through during its embryonic and fetal development are representative of the stages of evolutionary development of its species. However, it is important to note that this theory has been largely discredited and is no longer widely accepted in the scientific community.

"Ontogeny Recapitulates Phylogeny" Means That