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  2. Spontaneous generation - Wikipedia

    en.wikipedia.org/wiki/Spontaneous_generation

    Spontaneous generation is a superseded scientific theory that held that living creatures could arise from non-living matter and that such processes were commonplace and regular.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.

  3. Abiogenesis - Wikipedia

    en.wikipedia.org/wiki/Abiogenesis

    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.

  4. Reproduction - Wikipedia

    en.wikipedia.org/wiki/Reproduction

    The biological study of how the origin of life produced reproducing organisms from non-reproducing elements is called abiogenesis. Whether or not there were several independent abiogenetic events, biologists believe that the last universal ancestor to all present life on Earth lived about 3.5 billion years ago .

  5. Biosphere - Wikipedia

    en.wikipedia.org/wiki/Biosphere

    The biosphere is postulated to have evolved, beginning with a process of biopoiesis (life created naturally from non-living matter, such as simple organic compounds) or biogenesis (life created from living matter), at least some 3.5 billion years ago. [3] [4] In a general sense, biospheres are any closed, self-regulating systems containing ...

  6. Non-planetary abiogenesis - Wikipedia

    en.wikipedia.org/wiki/Non-planetary_abiogenesis

    In chapter "Stellar Graveyards, Nucleosynthesis, and Why We Exist" of The Stars of Heaven (2001) Clifford A. Pickover discusses various forms of abiological lifes. He poses the question whether in the times of ultimate expansion of the Universe with extremely low density of matter some structures could exist that can support the life of the ...

  7. Panspermia - Wikipedia

    en.wikipedia.org/wiki/Panspermia

    [10] [11] [12] This point is often used as a criticism of the theory. Panspermia is a fringe theory with little support amongst mainstream scientists. [13] Critics argue that it does not answer the question of the origin of life but merely places it on another celestial body. It is further criticized because it cannot be tested experimentally.

  8. The Vital Question - Wikipedia

    en.wikipedia.org/wiki/The_Vital_Question

    The Vital Question is a book by the English biochemist Nick Lane about the way the evolution and origin of life on Earth was constrained by the provision of energy.. The book was well received by critics; The New York Times, for example, found it "seductive and often convincing" [1] though the reviewer considered much of it speculative beyond the evidence provided.

  9. Life - Wikipedia

    en.wikipedia.org/wiki/Life

    Life is a quality that distinguishes matter that has biological processes, such as signaling and self-sustaining processes, from matter that does not. It is defined descriptively by the capacity for homeostasis, organisation, metabolism, growth, adaptation, response to stimuli, and reproduction.