Haeckel’s law

Haeckel's Law, formulated by the German biologist Ernst Haeckel in the 19th century, is a concept in embryology that suggests ontogeny recapitulates phylogeny. This means that the development of an individual organism (ontogeny) mirrors the evolutionary history of its species (phylogeny). According to Haeckel, during ___ ___ __________ __________ ____.
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