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Dante Gabriel Rossetti, How They Met Themselves, watercolour, 1864. A doppelgänger [a] (/ ˈ d ɒ p əl ɡ ɛ ŋ ər,-ɡ æ ŋ-/ DOP-əl-gheng-ər, -gang-), sometimes spelled doppelgaenger or doppelganger, is a ghostly double of a living person, especially one that haunts its own fleshly counterpart.
Scientists postulate one of the reasons for the rapid selection of this genetic variant is the lethality of the disease in non-immune persons. [ 187 ] [ 188 ] Other reported evolutionary trends in other populations include a lengthening of the reproductive period, reduction in cholesterol levels, blood glucose and blood pressure.
Professor of biology Jerry Coyne sums up biological evolution succinctly: [3]. Life on Earth evolved gradually beginning with one primitive species – perhaps a self-replicating molecule – that lived more than 3.5 billion years ago; it then branched out over time, throwing off many new and diverse species; and the mechanism for most (but not all) of evolutionary change is natural selection.
Mutual Aid: A Factor of Evolution is a 1902 collection of anthropological essays by Russian naturalist and anarchist philosopher Peter Kropotkin.The essays, initially published in the English periodical The Nineteenth Century between 1890 and 1896, [1] explore the role of mutually beneficial cooperation and reciprocity (or "mutual aid") in the animal kingdom and human societies both past and ...
Ace trivia night with these cool and random fun facts for adults and kids. This list of interesting facts is the perfect way to learn something new about life.
On the Origin of Species (or, more completely, On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life) [3] is a work of scientific literature by Charles Darwin that is considered to be the foundation of evolutionary biology.
Controversy exists as to whether Charles Darwin recognized a true geographical-based model of speciation in his publication On the Origin of Species. [5] In chapter 11, "Geographical Distribution", Darwin discusses geographic barriers to migration, stating for example that "barriers of any kind, or obstacles to free migration, are related in a close and important manner to the differences ...
III) Laws of Nature: A third way scientists get at the configuration of Nature is by Summing up phenomena into 'Laws of Nature'. Kepler's Law of elliptical orbits, or Netwon's Law of Gravitation — where every body attracts every other body proportionally to their mass and inversely to the square of the distance between their centres.