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Solar System began to form. (a whirling ball of gas was pulled together by gravity and formed by the sun)
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Earth began to form by colliding with space debris.
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Dates the largest known rocks and crystals so scienctists infer that organic molecules began to accumulate.
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Types of cellular life first populated the Earth.
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Fossils of stromatolites which are layered structures made of lynboya.
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Some forms of life became photosynthetic
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Earth appears
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Oxygen levels reached today's levels.
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A type of small aerobic prokaryote was englufed by and began to live inside a bigger prokaryote.
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Ozone (O3) formed - protected organisms from harmful UV rays so they could exist on land.
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The first light microscopes were created in 1665. Helping sciencetists to more easily see things that were to small for the human eye to see.
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Pasteur’s experiment disproved the theory of spontaneous generation all together. His experiment of using a curved bottle neck on a bottle of broth allowed it to touch air but also allowed for no new materials or organisms to contaminating the broth.
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Radiomertric dateing is a technique tahst used to date things like rocks, based on radioactive isotope and its decay products, using known decay rates. This helps sciencetist know how old the earht is and how things evolve
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They did an experiment in using molecules that resembled major components of the early earth’s atmosphere. After running this through an electric current they noticed that this had created some forms of organic material and amino acids. This helped prove that life didn’t just come out of spontaneous generation.
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Fox's research on physical structure has given rise to the first cells.
Fox showed evidence that the earliest cells were formed through a process that makes coacervates. -
Lynn Margulis’s theory said that established over time natural selection acting apon mutations could generate new adaptations and new species. This helped explain further how life came to be .
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Dr. Cech became the first to show that RNA molecules are able to be passive carriers of genetic information in similar to the way of enzymes.
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1668
Redi in 1668 helped prove that spontaneous generationwas false by the experiment when he used meat by covered one and leaving one uncovered to disprove that flies were born out of meats. -
Spallanzani’s experiments were the experiment that used broth that was in a open bottle and broth in a closed bottle. His experiment helped conclude that spontaneous generation theory was not true.
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Oparin’s hypothesis suggested that organic compounds could undergo a series of reactions leading to more and more complex molecules. This hypothesis of his said that life forms could have taken part in an evolutionary processes, eventually leading to the first life forms, completely disproving the spontaneous generation theory and helping explain where life actually came from.
