“I established the opposite view, that this history of the embryo (ontogeny) must be completed by a second, equally valuable, and closely connected branch of thought - the history of race (phylogeny). Both of these branches of evolutionary science, are, in my opinion, in the closest causal connection; this arises from the reciprocal action of the laws of heredity and adaptation... 'ontogenesis is a brief and rapid recapitulation of phylogenesis, determined by the physiological functions of heredity (generation) and adaptation (maintenance).” ActionLawViewsRaceOpinionGenerationsConnectionsOppositesFunctionValuableConnectedDeterminedAriseBranchesClosestAdaptationRapidsMaintenanceReciprocalPhysiologicalHeredityEmbryosRecapitulation Author:Ernst Haeckel
“Both of these branches of evolutionary science, are, in my opinion, in the closest causal connection; this arises from the reciprocal action of the laws of heredity and adaptation.” ActionLawOpinionConnectionsAriseBranchesClosestAdaptationReciprocalHeredityRecapitulation Book:the riddle of the universe Source: the riddle of the universe
“By ecology we understand the total science of the connections of the organism to the surrounding external world.” WorldConnectionsOrganismsEcology Author:Ernst Haeckel
