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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 . In biology, evolution is any change across successive generations in the heritable ...
Panspermia is the hypothesis that life exists throughout the universe, distributed by meteoroids, asteroids, comets [1] and planetoids. [2] It does not attempt to explain how life originated, but shifts the origin to another heavenly body. The advantage is that life is not required to have formed on each planet it occurs on, but rather in a ...
Map of early human migrations based on the Out of Africa theory; figures are in thousands of years ago (kya).. The peopling of the Americas began when Paleolithic hunter-gatherers (Paleo-Indians) entered North America from the North Asian Mammoth steppe via the Beringia land bridge, which had formed between northeastern Siberia and western Alaska due to the lowering of sea level during the ...
The experiment. The Miller–Urey experiment [1] (or Miller experiment [2]) was an experiment in chemical synthesis carried out in 1952 that simulated the conditions thought at the time to be present in the atmosphere of the early, prebiotic Earth. It is seen as one of the first successful experiments demonstrating the synthesis of organic ...
The genetic history of the Indigenous peoples of the Americas is divided into two distinct periods: the initial peopling of the Americas during about 20,000 to 14,000 years ago (20–14 kya), and European contact, after about 500 years ago. [1] [2] The first period of the genetic history of Indigenous Americans is the determinant factor for the ...
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. It was published on 24 November 1859. [4]
In American schools, the Genesis creation narrative was generally taught as the origin of the universe and of life until Darwin's scientific theories became widely accepted. . While there was some immediate backlash, organized opposition did not get underway until the Fundamentalist–Modernist controversy broke out following World War I; several states passed laws banning the teaching of ...
Iron–sulfur world hypothesis. The iron–sulfur world hypothesis is a set of proposals for the origin of life and the early evolution of life advanced in a series of articles between 1988 and 1992 by Günter Wächtershäuser, a Munich patent lawyer with a degree in chemistry, who had been encouraged and supported by philosopher Karl R. Popper ...