"Phylogeny and ontogeny are, therefore, the two coordinated……" — Ernst Haeckel

"Phylogeny and ontogeny are, therefore, the two coordinated branches of morphology. Phylogeny is the developmental history [Entwickelungsgeschichte] of the abstract, genealogical individual; ontogeny, on the other hand, is the developmental history of the concrete, morphological individual."

Ernst Haeckel

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