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A nearly spherical mass of burning gasses.
Gravity pulled gasses toghether to form the Sun,
The energy from the sun influenced and created life on Earth. -
Earth formed and collided with space debris.
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Earth is formed.
Volcanoes emit gas forming an atmosphere. -
Evidence of first cells.
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Stromatoilites lived.
Fossils found. -
Cyanobacteria lives.
Some forms of life becomes photosynthetic. -
Earth looks like it does today.
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Method of energy synthesis.
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Protects organisms from harmful UV rays so they can exist on land.
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Redi concluded that when flies landed on meat they layed eggs that became maggots that then became adult flies.
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Two Dutch scientists, Zaccharias Janssen and his son Hans, were experimenting with several lenses in a tube and discovered that nearby objects appeared greatly enlarged
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Oparin hypothesized that the formation of amino acids and proteins from non-biological chemicals could have occurred in the conditions shortly after the formation of the Earth.
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Used to determine the age of rocks and rock layers.
Can only date rocks and rock layers up to 60,000 years old. -
Cech studied the splicing of RNA in an unicellular organism called, "Tetrahymena thermophila." He discovered that an unprocessed RNA molecule could splice itself or copy itself.
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They created an experiment that simulated the conditions of early Earth and tested for the occurence of chemical origins of life.
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Fox studied the formation of peptide structures under conditions that might have existed in early Earth's history. He discovered that amino acids could spontaneously form small peptides. These amino acids and small peptides could form closed spherical membranes, called , "proteinoid microspheres," which show many of the basic characteristics of life.
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Margulis believes that the symbionic relationships between different phylums between different organisms are the "driving force of evolution."
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Spallanzani concluded that open-aired flasks, after being boiled, were exposed to microorganisms, that contaminated the broth. Broth that had a lid, was not effected by microorganisms.
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Very similar to Spallazani's experiment, Pasteur's experiment was about microorganisms. He did everything the same, boiling broth and testing for contaminated samples, and he discovered that an uncovered curved-neck flask would not be effected by microorganisms.
