Life origination theory

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  • 590 BCE

    Spontaneous Generation

    Consists on the thoughts of life coming from non-living objects. The idea was first given by Anaximander a greek philosopher and he believed that everything arose out of the elemental nature of the universe. The theory was disproved by Francesco Redil in 1668 making an experiment with fresh meat in different jars to see what happened to it.
  • 500 BCE

    Panspermia

    Panspermia translates literally to "seeds everywhere" and consists in the belief of seeds of life travelling through space. Anaxagoras was the first known mention of the theory in 500 B.C. there have been many modifications throughout the years, such as 1743- Benoit de Malliet, 1871- Lord Kelvin and in 1973 Francis Crick and Leslie Orgel win Nobel Prize for the direct panspermia theory.
  • 400

    Creationist

    Is about the belief that a god or any religious figure created life and is responsible for everything in the world. The date of it is not exact because there are many​ points in time where people had gods and believed that they were the responsible of life.

  • Use and Disuse

    Chevalier de Lamarck proposed a huge theory about evolution that consisted of the use and disuse of things. This means if you use too much something in your body it will probably improve and if you don't, ti will probably​ disappear.

  • Natural Selection

    Darwin proposed a theory of evolution about the natural selection which was slow but precise and sure. It consisted in the idea of a species developing new characteristics for things that are needed and best applied to their survival.

  • Biogenesis

    Rudolf Virchow proposed this theory in 1858 against the spontaneous generation theory. The theory claims that living cells can arise only from preexisting living cells, but it couldn't be proven until 1861 by Louis Pasteur.

  • Intelligent evolution

    Alfred Wallace based his theory on Darwin’s Natural selection theory, but he insisted that where no clear survival advantage can be found, some teleological and intelligent agency must be the cause.

  • Physical Chemical

    Proposed by Aleksander Oparin in 1923 and supported by John Buldon Hardane in 1928. Explains how life occurred​ 3.8 million years ago by a slow process of chemical evolution in the environment and organisms. Disproves the spontaneous generation theory because it could not have been possible by the environmental conditions of that time. The first amino acids​ were created in a primitive atmosphere.

  • Impact theory

    Consists on the belief of dinosaurs being extinct by a meteorite impact of about 10km diameter that led a crater of about 150-200 km wide. Is believed that the impact was around 65 million years ago.

  • Endosymbiotic

    In 1981, Lynn Margulis proposed the endosymbiotic theory that consists of the origin of mitochondria were separate organisms that originally entered into a symbiotic relationship with eukaryotic cells through endosymbiosis. Origin of the chloroplast and mitochondria.

  • Volcanoe extinction theory

    It consists on the belief of dinosaurs being extinct by a volcanoe and not by a meteorite. It is based on teh idea that tens of thousands of years of lava flow from the Deccan Traps and is probable that was a volcanoe what killed the dinosaurs. However it is said that the metorite released big amounts of dust, blocking out the sun to cause widespread cooling, choking the dinosaurs and poisoning sea life. The meteorite may impact may also have set off volcanic activity.