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The Greek philosopher and naturalist stated in an unknown year the theory in which living organism could arise from inanimate matter.

Although his "discovery" wasn't fully original and unable to be proven, this theory was taken by the public as a scientific fact and believed in it for two millenia until Aristotle started to be combated by new and updated theories from scientist around the world.

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Theophrastus was a botanist, biologist, and phisicist who's speciality was the knowledge of plants.

Him, alongside Aristotlre who's speciality is animals, and Paracelsus , worked in the Spontaneus Generation Theory. He was known as "The Father of Botany"

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Paracelsus was also involved in the Spontaneus Generation Theory.

Him and Aristotle stated that "all animals and plants, however, complicated, are constituted of a few-element which are repeated in each of them”.

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Francesco Redi rejected the spontaneus generation theory.

This by using two flasks with meat inside, one closed, one open. If the flies appeared in the closed flask, they would just generate "spontaneously". Of course people said that that didn't work because life was in the air.

He proceded to add another flask with holes in it.

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Lazzaro Spallanzani rejected the theory too.

Flasks with soup to create bacteria, closed and open. In the closed one life didn't appear, in the open one it did.

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Louis Pasteur's swan neck flask experiment also rejected the spontaneous generation theory.

He put two of them but one with the neck incomplete, that way bacteria entered easily to one of them, but in the other the bacteria would get "trapped" in the neck.

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They added ammonia, Methane and Hydrogen, wich were present in the athmosphere. They used electric discharges as a source of energy to assimilate lightning. Amino acids and other carbon compund were created.

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Lynn Margulis was a very popular american biologist mostly known for her endosymbiotic theory which describes the origin of eukaryotic cells as a result of symbiogenetic incorporations of prokyriotic cells.

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Lynn Margulis is the author of the endosimbyotic theory,

The first were the procaryotes, then the eukaryote absorbed the procaryotes and their "abilities". Basically a cell living inside a cell.

The chloroplasts and mitochondrion are absorbed, they still have their own membrane when inside the

Procaryote
Chloroplasts: photosynthesis: light-->glucose
Mithocondrion: cell respiration:  O2--> ATP
Eukaryote
Endocytosis(both)
animal cells don't absorbe chloroplast