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Some have proposed a timeline of more than 30 potential significant chemical events between pre-RNA world to near but before LUCA just involving RNA. The timeline does not include metabolism related events (e.g. origins of ATP, glycolysis, the Krebs cycle, the electron transport chain, etc). [187] RNA is central to the translation process.
A scenario is a set of related concepts pertinent to the origin of life (abiogenesis), such as the iron-sulfur world. Many alternative abiogenesis scenarios have been proposed by scientists in a variety of fields from the 1950s onwards in an attempt to explain how the complex mechanisms of life could have come into existence. These include ...
Maslow’s hierarchy of needs is a conceptualisation of the needs (or goals) that motivate human behaviour, which was proposed by the American psychologist Abraham Maslow. [ 1 ] [ 2 ] According to Maslow’s original formulation, there are five sets of basic needs that are related to each other in a hierarchy of prepotency (or strength).
The theory held that "lower" animals are generated by decaying organic substances. Aristotle stated that, for example, aphids arise from dew on plants, flies from putrid matter, mice from dirty hay, and crocodiles from rotting sunken logs. [16] The basic idea was that life was continuously created as a result of chance events. [17]
Since then, the primordial soup theory (Oparin–Haldane hypothesis) has become the foundation in the study of abiogenesis. [88] [89] [90] Although Oparin's theory became widely known only after the English version in 1936, Haldane accepted Oparin's originality and said, "I have very little doubt that Professor Oparin has the priority over me ...
Alexander Graham Cairns-Smith FRSE (24 November 1931 – 26 August 2016) was an organic chemist and molecular biologist at the University of Glasgow. [1] He studied at the University of Edinburgh, where he gained a Ph.D. in Chemistry (1957). [2]
The Boeing 747 was not designed in a single unlikely burst of creativity, just as modern lifeforms were not constructed in one single unlikely event, as the junkyard tornado scenario suggests. The theory of evolution has been studied and tested extensively by numerous researchers and scientists and is the most scientifically accurate ...
Abraham Maslow proposed many of his theories of human growth in the form of testable hypotheses, [30] [31] [32] and he encouraged scientists to put them to the test. Shortly after the founding of the American Association of Humanistic Psychology, its president, psychologist Sidney Jourard , began his column by declaring that "research" is a ...