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Our solar system was a swirling mass of gas and dust. Over time it formed into the sun. Then the solar system was born. Some scientist believe that planets were formed by the collisions of space debris.
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Collisions from the earth and the solar system debris developed a great deal of thermal energy.
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Archaea are thought to be similar to the types of cellular life that first populated the earth around this time.
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- Estimated age of earth -Oldest rocks known are dated around this time -organic molecules began to accumulate
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Lynbgya, a genus of modern cyanobacteria, often grow in colonies and form layered structurs called stromatolits. Their fossils are as old 3.5 BYA.
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Some forms of life had become photosynthetic. It is a process that converts carbon dioxide into organic compounds, especially sugars, using the energy from sunlight.
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Oxygen appears in the envirment causing damage to livivng things.
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O2 levels reached todays level. This could be harmful because i could change the futur from then to now.
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Endosymbiosis occured and the first eukaryotic organisms were formed. Endosymbiosis is any organism that lives within the body or cells of another organism,
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Ozone formed- protected organisms from harmful UV rays so they could exist on land. Protects people today from the same problem
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Concluded that the boiled broth in his experiment became contaminated only when the flask was open. Thats when the microorganisms could enter the flask. Argued that the microorganisms were from other things, not the "vital force"
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Reasoned that the contamination was due to microorganisms in the air
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His hypothesis: After the explanation the results is it ultimately would have resulted in the macromolecules contaminated the broth.
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Had done extensive reaserch on the physical structures that may have given rise to the first cells.
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He found types of RNA that were found in unicellular eukaryotes that is able to act as a chemical catalyst.
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A method of finding out the age of material by radioactivity.
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Set up experiments using Oparin's hypothesis as a starting point. From that they produced a varriety of organic compounds including amino acids.
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Proposed that early prokaryotic cells may have developed a mutualy beneficial relationship.
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Redi- Showed convincingly that flies come only from eggs laid by other flies.
Microscope: It reveled a whole new world for scientist.
