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According to this theory, all the different forms of life that occur today on planet earth, have been created by God, the almighty. Adam and Eve were, according to the Book of Genesis, Bible and Quran the first man and woman created by the God. Life on earth began from them according to Christians, Muslims and Jews.
Speciation stretches back over 3.5 billion years during which life has existed on earth. It is thought to occur in multiple ways such as slowly, steadily and gradually over time or rapidly from one long static state to another.
According this theory, the origin of life on earth is the result of a slow and gradual process of chemical evolution that probably occurred about 3.8 billion years ago.
The endosymbiotic theory was first articulated by the Russian botanist Konstantin Mereschkowski in 1905. According to this theory, certain organelles originated as free-living bacteria that were taken inside another cell as endosymbionts.
Cosmogeny, is any theory concerning the coming into existence or origin of the universe, or about how reality came to be. In the specialized context of space science and astronomy, the term refers to theories of creation of (and study of) the Solar System.
Until the early 19th century, people generally believed in the ongoing spontaneous generation of certain forms of life from non-living matter. This was paired with the belief in heterogenesis, e.g. that one form of life derived from a different form (e.g. bees from flowers). Classical notions of spontaneous generation, held that certain complex, living organisms are generated by decaying organic substances.
A model for the origin of life based on clay was forwarded by A. Graham Cairns-Smith of the University of Glasgow in 1985 and explored as a plausible illustration by several other scientists, including Richard Dawkins.
The idea of extinction paved the way for the theory of catastrophism or “consecutive creations”, one of the predecessors of the evolution theory. Catastrophism is the idea that Earth has been affected in the past by sudden, short-lived, violent events, possibly worldwide in scope.