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The sun and other planets began forming by gravity and collisions of space debris.
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The earth formed by gravity pulling debris together.
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The earth's surface began cooling and organic molecules began accumulating.
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Archaea-like life existed on earth.
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Stromatolites are cyanobacteria that form large colonies and grow in layers.
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Some forms of life had become photosynthetic.
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The earth cooled and looks very similar to today.
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Oxygen in the atmosphere reached today's levels.
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Prokaryote began to live and reproduce.
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Ozone formed to protect organisms from harmful UV rays so they could exsist on land.
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It allowed scientists to closer examine living things. It led to the discovery of cells.
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Redi placed rotting meat in a jar with and without a cover. Maggots formed in the jar without the lid and none with the lid. This proved that flies do not spontaneoulsy generate.
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He boiled broth and sealed some of the flasks. The unsealed flask grew microorganisms. The sealed one did not grow microorganisms. This proved that microorganisms do not spontaneously generate.
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He did the same experiment as Spallanzani, but used a curved necked flask showing that vital force could still be present, but not spotaneous generation.
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Radiometric dating used half-lives of elements to determine how long a sample of something has meen decaying. It allows us to determine the earth's age.
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He thought early atmosphere contained ammonia. hydrogen gas. water vapor, and compounds of hydrogen and carbon. They recombined to be organic compounds.
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They tested Oparin's hypothesis with gases and electic sparks. He proved Oparin's hypothesis was correct.
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He did research on organisms that may have given rise to the first cells, such as coacervates and microspohere. It helped exlain where the first cells came from.
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She proposted a theory of endosymbiosis; a small prokaryote is inside a larger one. The prokaryotes led to mitochondria. This helped discover why eukaryotic cells formed.
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He found type of RNA in some unicellular eukaryotes that could act as a catalyst. He led other scientists to discover that this RNA could self-replicate.
