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theories to the origin of man.

Theory of Special Creation

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.

Organic Evolution

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.

Materialistic Theory

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.

Panspermia

Panspermia is the hypothesis that life exists throughout the Universe, distributed by meteoroids, asteroids and planetoids. Panspermia proposes that life that can survive the effects of space, such as extremophile bacteria, become trapped in debris that is ejected into space after collisions between planets that harbor life and Small Solar System Bodies (SSSB).

Biopoesis

In natural science, abiogenesis or biopoesis is the study of how biological life arises from inorganic matter through natural processes, and the method by which life on Earth arose. Most amino acids, often called “the building blocks of life”, can form via natural chemical reactions unrelated to life, as demonstrated in the Miller–Urey experiment and similar experiments that involved simulating some of the conditions of the early Earth in a laboratory

Endosymbiosis

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

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.

Spontaneous Generation

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.

Clay Theory

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.

Theory of Consecutive Creations

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.

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