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Solar system began to form . Solar system was a swriling mass of gas.
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Earth grew larger as gravity pulled in more debris. Collisions between earth and space debris also released a great deal of thermal energy.
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Organic molecules began to accumulate.
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Oldest known rocks and crystals began to form.
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Fossils of stromatolites were discovered from around 3.5 BYA.
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Some forms of life become photosynthetic.
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Earth probably appeared much as it does today.
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O2 levels reached today's levels.
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Endo- Symbosis is formed in mitochondria.
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Ozone (O3) formed - protected organisms from harmful UV rays so they could exist on land.
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Fransico Redi was one of the first to disprove spontaneous generation. He was an Italian doctor who proved maggots came from flies.
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Experimented with broth and microorganisms in both a sealed and open flask.
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Used a revised version of Spallanzani's design to support microorganisms are carried in the air and that they do not arise by spontatneous generation. He used a curved neck flask to show that the mircoorganisms were coming from the air and could not travel into the flask .
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Oparin's thought that the early atmosphere contained ammonia, hyydrogen gases, water vapor, and compunds that were made of hydrogen and carbon such as methane. At high temperatures these gases may have formed simple organic compunds . When earth cooled and water vapor formed lakes and seas simple compounds would have collected in the water. Overtime they entered complex chemical reactions fueled by energy from lightening and ultraviolent radiation.
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First microscope invented. Hooke exaxmined pieces of cork to look at there cells.
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Thomas Cech's main research area is that of the process of transcription in the nucleus of cells.
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The Miller and Urey experiment was an experiment that simulated hypothetical conditions thought at the time to be present on the early Earth, and tested for the occurrence of chemical origins of life.
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PErformed research on physical structures that may have given rise to the first cell.
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Lynn Margulis is known for her theory on the origin of eukaryotic organelles,
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Radiometric datingis a technique used to date materials such as rocks.
