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384-322 BC: Spontaneous generation theory was firstly recorded by greek philosopher, Aristotle; this theory stated that life came from nonliving matter because of a material called pneuma. . 

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384-322 BC: Spontaneous generation theory was firstly recorded by greek philosopher, Aristotle; this theory stated that life came from nonliving matter because of a material called pneuma. . 

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Meath broth, to prove Spontaneous generation theory.

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371-287 BC: Theophrastus, astrologist and alquimist, also contributed to this theory: stating that plants grow spontaneously from seeds, or other parts of the plant, showing that factors as sun and climate only improved their growth.

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371-287 BC: Theophrastus, astrologist and alquimist, also contributed to this theory: stating that plants grow spontaneously from seeds, or other parts of the plant, showing that factors as sun and climate only improved their growth.

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1493-15921: Paracelsus, with diverse opinions regarding his biology and philosophical works, believed in spontaneus generation, which produced small animals from herbs by putrefaction. 

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1493-15921: Paracelsus, with diverse opinions regarding his biology and philosophical works, believed in spontaneus generation, which produced small animals from herbs by putrefaction. 

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1626- 1697: Francisco Redi, dismissed the veracity of the spontaneous generation theory, until date, widely accepted by the scientific community; with his experiment of observation of two flasks with meat broth, one closed and the other one open, he demonstrated  that maggots only appeared in the open fask, showing that flies were causing the organisms. 

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1626- 1697: Francisco Redi, dismissed the veracity of the spontaneous generation theory, until date, widely accepted by the scientific community; with his experiment of observation of two flasks with meat broth, one closed and the other one open, he demonstrated  that maggots only appeared in the open fask, showing that flies were causing the organisms. 

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1768: Italian biologist, Lazzaro Spallanzani repeated Needham's experiment with broths. He boiled them, sealing one jar and leaving another open. He found that only the open jar developed microbial growth, suggesting that air introduced the microbes.His experiment disapproved Spontaneous generation theory completely. 

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1768: Italian biologist, Lazzaro Spallanzani repeated Needham's experiment with broths. He boiled them, sealing one jar and leaving another open. He found that only the open jar developed microbial growth, suggesting that air introduced the microbes.His experiment disapproved Spontaneous generation theory completely. 

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1859: Louis Pasteur, a French microbiologist, conducted and experiment with flasks designed to allow air exchange but prevent microorganism entry; the broth became cloudy. Pasteur's experiment proved that microbial growth in broth was not due to spontaneous generation, instead, to introduction of microorganisms from the air.

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1859: Louis Pasteur, a French microbiologist, conducted and experiment with flasks designed to allow air exchange but prevent microorganism entry; the broth became cloudy. Pasteur's experiment proved that microbial growth in broth was not due to spontaneous generation, instead, to introduction of microorganisms from the air.

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20th century approx: Panspermia; this theory for cell origin, proposed that life on Earth may have started from microorganisms or biochemical substances delivered to our planet via comets, meteorites, or interstellar dust particles.

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20th century approx: Panspermia; this theory for cell origin, proposed that life on Earth may have started from microorganisms or biochemical substances delivered to our planet via comets, meteorites, or interstellar dust particles.

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20th century approx: Hydrothermal Vent Hypothesis; this hypothesis proposed that life originated at hydrothermal vents on the ocean floor, creating early life forms.

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20th century approx: Hydrothermal Vent Hypothesis; this hypothesis proposed that life originated at hydrothermal vents on the ocean floor, creating early life forms.

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 1953: the Miller-Urey experiment simulated early Earth conditions, showing that organic molecules like amino acids, crucial for life, could arise abiogenically from inorganic compounds. This supported Oparin and Haldane's ideas, demonstrating the potential for life's chemical origins to be scientifically tested.

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 1953: the Miller-Urey experiment simulated early Earth conditions, showing that organic molecules like amino acids, crucial for life, could arise abiogenically from inorganic compounds. This supported Oparin and Haldane's ideas, demonstrating the potential for life's chemical origins to be scientifically tested.

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1960s: RNA World Hypothesis; The RNA World hypothesis states that life may have originated from self-replicating RNA molecules, which altogether became earth-life forms. 

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1960s: RNA World Hypothesis; The RNA World hypothesis states that life may have originated from self-replicating RNA molecules, which altogether became earth-life forms. 

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Non specified date: Membrane/protocell; this hypothesis stated the formation simple, membrane-bound structures;These structures could have encapsulated organic molecules, potentially showing the development of cellular functions and, eventually, more complex life forms.

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Non specified date: Membrane/protocell; this hypothesis stated the formation simple, membrane-bound structures;These structures could have encapsulated organic molecules, potentially showing the development of cellular functions and, eventually, more complex life forms.

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1905 and 1910:  The endosymbiotic theory stated that some organelles found in eukaryotic cells today, used to be microbes working independently (prokaryotes). 3 principal proved evidences sustain these: Mitochondria and chloroplasts are the same size as prokaryotic cells and divide by binary fission; mitochondria and chloroplasts have their own DNA which is circular, not linear.;mitochondria and chloroplasts have their own ribosomes which have 30S and 50S subunits, not 40S and 60S.

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1905 and 1910:  The endosymbiotic theory stated that some organelles found in eukaryotic cells today, used to be microbes working independently (prokaryotes). 3 principal proved evidences sustain these: Mitochondria and chloroplasts are the same size as prokaryotic cells and divide by binary fission; mitochondria and chloroplasts have their own DNA which is circular, not linear.;mitochondria and chloroplasts have their own ribosomes which have 30S and 50S subunits, not 40S and 60S.

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Vedantu. (n.d.). The term "classification" was coined by whom? Vedantu. https://www.vedantu.com/question-answer/the-term-classification-was-coined-by-a-class-11-biology-cbse-5f86f76c177aeb6799e573ae#:~:text=Theophrastus%20categorized%20plants%20into%20four,his%20book%20%22Historia%20Plantarum%22.

CSIC. (n.d.). Museo virtual Gregor Mendel. Consejo Superior de Investigaciones Científicas. https://museovirtual.csic.es/salas/mendel/m3.htm

BYJU'S. (n.d.). Spontaneous generation theory. BYJU'S. https://byjus.com/biology/spontaneous-generation-theory/

Encyclopædia Britannica. (n.d.). Abiogenesis. In Encyclopædia Britannica. Retrieved [2024, april 26th], from. https://www.britannica.com/science/abiogenesis

Discover Magazine. (n.d.). How cell membranes may have kicked off the origin of life. Discover Magazine. Retrieved [2024, april 26th], from https://www.discovermagazine.com/environment/how-cell-membranes-may-have-kicked-off-the-origin-of-life

LibreTexts. (n.d.). The endosymbiotic theory. In Microbiology (Kaiser). LibreTexts. Retrieved [insert date], from https://bio.libretexts.org/Bookshelves/Microbiology/Microbiology_(Kaiser)/Unit_4:_Eukaryotic_Microorganisms_and_Viruses/07:_The_Eukaryotic_Cell/7.8:_The_Endosymbiotic_Theory