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384 BCE
Spontaneous Generation
hypothetical process by which living organisms develop from nonliving matter
https://www.britannica.com/science/spontaneous-generation -
Dissaproval of spontaneous generation by Francesco Redi
Redi began a series of experiments that showed that dead meat does not give rise spontaneously to maggots. When maggots developed on the meat in the open jars, Redi believed he had demonstrated that spontaneous generation did not occur.
http://science.jrank.org/pages/6408/Spontaneous-Generation.html -
Panspermia
The panspermia hypothesis states that the "seeds" of life exist all over the Universe and can be propagated through space from one location to another. Some believe that life on Earth may have originated through these "seeds". -
Dissproval of Spontaneous Generation by Lazaro Spallanzani
Lazzaro Spallanzani did not agree with Needham’s conclusions, however, and performed hundreds of carefully executed experiments using heated broth. He was able to demonstrate that when properly heated in sealed flasks, no soups of any kind supported life, but when contaminated air was admitted the life appeared. No "Vegetative Force" was needed. -
Catastrophism
Catastrophism, doctrine that explains the differences in fossil forms encountered in successive stratigraphic levels as being the product of repeated cataclysmic occurrences and repeated new creations -
Creationism
Theory holding the beliefs that matter and al its iving things were created by a God of nothing -
Disproval by Louis Pasteur
Pasteur’s set of experiments irrefutably disproved the theory of spontaneous generation Pasteur recounted his famous swan-neck flask experiment, stating that “life is a germ and a germ is life. -
Primordial Soup
The Primordial Soup Theory suggest that life began in a pond or ocean as a result of the combination of chemicals from the atmosphere and some form of energy to make amino acids, the building blocks of proteins, which would then evolve into all the species. -
Hydrothermal Vents
A new theory proposes the primordial life-forms that gave rise to all life on Earth left deep-sea vents because of their "invention" of a tiny pump. These primitive cellular pumps would have powered life-giving chemical reactions.