“The succession of individuals, connected by reproduction and belonging to a species, makes it possible for the specific form itself to last for ages. In the end, however, the species is temporary; it has no "eternal life." After existing for a certain period, it either dies or is converted by modification into other forms.” LifeEndsAgeLastsFormScienceCertainDiesIndividualExistenceEvolutionPeriodsEternalSpeciesConnectedBelongingTemporaryEternal LifeSuccessionReproductionModification Book:Wonders of life Source: Wonders of life
“In the course of individual development, inherited characters appear, in general, earlier than adaptive ones, and the earlier a certain character appears in ontogeny, the further back must lie in time when it was acquired by its ancestors.” CharacterLyingCertainCoursesIndividualDevelopmentAncestorGeneticsAdaptive Author: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.” TwoHandsScienceIndividualAbstractBranchesConcreteDevelopmentalNomenclatureMorphology Author:Ernst Haeckel
