Law of RecapitulationEdit
Although Haeckel supported Darwin's theory of evolution, he did not support his theory of natural selection. Haeckel stressed the inheritance of acquired traits and proposed the idea of recapitulation. Recapitulation is a belief that early embryos of different species resemble each other. His theory was quoted as "ontogeny recapitulates phylogeny". Haeckel believed that the human embryo first shows characteristics of a fish, then a reptile, then a human. This theory was Haeckel's most famous, but has since been found untrue and discredited.
Pappas, S. (2013, September). Haekel, ernst (1834-1919) . Retrieved from http://scienceworld.wolfram.com/biography/Haekel.html