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NASA's 2015 strategy for astrobiology aimed to solve the puzzle of the origin of life – how a fully functioning living system could emerge from non-living components – through research on the prebiotic origin of life's chemicals, both in space and on planets, as well as the functioning of early biomolecules to catalyse reactions and support inheritance.
Spontaneous generation is a superseded scientific theory that held that living creatures could arise from non-living matter and that such processes were commonplace and regular. It was hypothesized that certain forms, such as fleas, could arise from inanimate matter such as dust, or that maggots could arise from dead flesh.
Bathybius haeckelii was a substance that British biologist Thomas Henry Huxley discovered and initially believed to be a form of primordial matter, a source of all organic life. He later admitted his mistake when it proved to be just the product of an inorganic chemical process (precipitation).
Bernal called this idea biopoiesis or biopoesis, the process of living matter evolving from self-replicating but non-living molecules, [17] [31] and proposed that biopoiesis passes through a number of intermediate stages. Robert Shapiro has summarized the "primordial soup" theory of Oparin and Haldane in its "mature form" as follows: [32]
Primordial soup, also known as prebiotic soup and Haldane soup, is the hypothetical set of conditions present on the Earth around 3.7 to 4.0 billion years ago. It is an aspect of the heterotrophic theory (also known as the Oparin–Haldane hypothesis) concerning the origin of life, first proposed by Alexander Oparin in 1924, and J. B. S. Haldane in 1929.
Therefore, a boundary is needed to separate life processes from non-living matter. [20] This fundamental necessity is underpinned by the universality of the cell membrane which is the only cellular structure found in all organisms on Earth.
Evolution of nervous systems – Origin and subsequent variation and development of neurons and neural tissues and organs; Evolution of snake venom – Origin and diversification of snake venom through geologic time; Evolution of the brain – Overview of the evolution of the brain
Abiogenesis or biopoiesis is the natural process of life arising from non-living matter such as simple organic compounds. Subcategories This category has the following 4 subcategories, out of 4 total.