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(5 BYA) The Sun was Born
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. -
(4.6) thermal Energy
Collisions from the earth and the solar system debris developed a great deal of thermal energy. -
(4 BYA) Archaea
Archaea are thought to be similar to the types of cellular life that first populated the earth around this time. -
(4 BYA) The beginning
- Estimated age of earth -Oldest rocks known are dated around this time -organic molecules began to accumulate
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(3.5 BYA) Fossils
Lynbgya, a genus of modern cyanobacteria, often grow in colonies and form layered structurs called stromatolits. Their fossils are as old 3.5 BYA. -
(3 BYA)
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. -
(2.2 BYA) Damage to the new earth
Oxygen appears in the envirment causing damage to livivng things. -
(2 BYA)Today's highs
O2 levels reached todays level. This could be harmful because i could change the futur from then to now. -
(1.5 BYA) Endosymbiosis
Endosymbiosis occured and the first eukaryotic organisms were formed. Endosymbiosis is any organism that lives within the body or cells of another organism, -
(1 BYA) Ozone Layor
Ozone formed- protected organisms from harmful UV rays so they could exist on land. Protects people today from the same problem -
(1700-1800) Spallanzani
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" -
(1800-1900) Pasteur
Reasoned that the contamination was due to microorganisms in the air -
(1920) Oparin
His hypothesis: After the explanation the results is it ultimately would have resulted in the macromolecules contaminated the broth. -
(1912-!998) Fox
Had done extensive reaserch on the physical structures that may have given rise to the first cells. -
(1947) Thomas Cech
He found types of RNA that were found in unicellular eukaryotes that is able to act as a chemical catalyst. -
(1950) Radiometric Dating
A method of finding out the age of material by radioactivity. -
(1953) Urey and Miller
Set up experiments using Oparin's hypothesis as a starting point. From that they produced a varriety of organic compounds including amino acids. -
(1960) Lynn Margulis
Proposed that early prokaryotic cells may have developed a mutualy beneficial relationship. -
(1600-1700) REDI
Redi- Showed convincingly that flies come only from eggs laid by other flies.
Microscope: It reveled a whole new world for scientist.
