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Reconstruction, left forefoot skeleton (third digit emphasized yellow) and longitudinal section of molars of selected prehistoric horses Skeletal evolution. The evolution of the horse, a mammal of the family Equidae, occurred over a geologic time scale of 50 million years, transforming the small, dog-sized, [1] forest-dwelling Eohippus into the ...
The timeline of the evolutionary history of life represents the current scientific theory outlining the major events during the development of life on planet Earth. Dates in this article are consensus estimates based on scientific evidence , mainly fossils .
Explorations and Field Work of the Smithsonian Institution in 1931. 1932. Gazin, C. L. '" Study of the Fossil Horse Remains from the Upper Pliocene of Idaho. Proceedings from the United States National Museum 83(2,985): 281-320. 1936. MacFadden, Bruce J. Fossil Horses: Systematics, Paleobiology and Evolution of the Family Equidae. Cambridge ...
The theory of recapitulation, also called the biogenetic law or embryological parallelism—often expressed using Ernst Haeckel's phrase "ontogeny recapitulates phylogeny"—is a historical hypothesis that the development of the embryo of an animal, from fertilization to gestation or hatching (), goes through stages resembling or representing successive adult stages in the evolution of the ...
Asexual reproduction can proceed by budding, fission, or spore formation and does not involve the union of gametes, which accordingly results in a much faster rate of reproduction compared to sexual reproduction, where 50% of offspring are males and unable to produce offspring themselves.
Evolution of cetaceans; Evolution of horses; Evolution of primates – Origin and diversification of primates through geologic time Evolution of humans – Evolutionary process leading up to the appearance of anatomically modern humans Evolution of human intelligence; Human evolutionary genetics – Study of differences between human genomes
The Neanderthal DNA found in modern human genomes has long raised questions about ancient interbreeding. New studies offer a timeline of when that occurred and when ancient humans left Africa.
The timeline of human evolution outlines the major events in the evolutionary lineage of the modern human species, Homo sapiens, throughout the history of life, beginning some 4 billion years ago down to recent evolution within H. sapiens during and since the Last Glacial Period.