Ontogeny recapitulates phylogeny

" Ontogeny recapitulates phylogeny. " Ernst Haeckel. Now considered incorrect.

Growth and development of an organism. As with growth of adding new parts that then change very little.

answer difference between ontogeny and phylogeny?

Ontogeny recapitulates phylogeny, or the development of the individual summarizes the evolution of the species. For example, human embryos go through a stage in which they develop gills as did their aquatic forerunners.