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Our solar system and earth was a swirling mass of gas, dust, and debris.
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Earth grew larger as gravity pulled in more debris
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Earth became formally formed. Period of recorded history began.
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The first cells were anaerobic, heterotrophic prokaryotes
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Fossils of stromatolites as old as 3.5 billion years old are known.
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Some forms of life had become photosynthetic.
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Earth appeared the same as it does today.
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O2 levels reached today's levels
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A type of small aerobic prokaryote was engulfedby and began to live and reproduce inside of a larger, anaerobic prokaryote. This theory is called endosymbiosis.
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protected organisms from harmful UV rays so they could exist on land
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Prooved that flies come only from eggs laid by other flies; disprooved spontaneous generation theory
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Revealed the world is filled with tiny creatures
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designed experiment to test the hypothesis of spontaneous generation of microorganisms
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Set up experiment that settled issue of spontaneous generation and prooved it wrong.
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early 1980's found that a type of RNA found in some unicellular eukaryotes is able to act as a chemical catalyst.
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proposed that early prokaryotic cells may have developed a mutually beneficial relationship
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Set up experiments that produced a variety of compounds, including amino acids.
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method to establish age of materials
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It is that organic compounds undergo reactions leading to more complex molecules- evenually leading to first life forms. Used in Urey & Miller's experiment
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did extensive research on the physical structures that may have given rise to the first cells
