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The Solar System began to form when clouds of gas and dust in space was disturbed.
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In the solar system, space debris started colliding with each other. The Earth began to form from the collision of space debris.
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Arcaea first populated Earth 4 BYA. These cell like structures lived in extreme environments and obtain their energy through chemosynthesis.
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Lynbgya, a genus of cyanobacteria, became to grow in colonies called Stromatolites.
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Some life forms had become photosynthetic. The discovery was important, as it first introduced oxygen.
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The Earth started to become much like today's Earth 2.2 BYA.
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The O2 levels reached today's level.
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Small aerobic prokaryotes were engulfed by and began to live within other prokaryotes. This eventually caused the formation of eukaryotes. The process was known as endosymbiosis.
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The ozone was formed to protect organisms from the harmful UV ryas. The formation of the ozone made possible for life to exist on land. Oxygen gas bombarded with sunlight, splitting some to individual oxygen molecules. The molecules then reacted to oxygen gas to form the ozone.
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First microscope was in use by Robert Hook. The use of the microscope led to the discovery of microorganisms.
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Francesco Redi’s experiment occurred. He experimented with rotting meat and the formation of flies.
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Lazzaro Spallanzani’s experiment occurred. He found that microorganisms do not arise spontaneously, but they were carried in the air.
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Louis Pasteur used a variation of Spallanzani’s experiment to support what Spallanzani found.
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Radiometric dating was invented by Ernest Rutherford to determine the age of the earth.
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Oparin suggested that if the primitive atmosphere was reducing, and there was an appropriate supply of energy, then a wide range of organic compounds might be synthesized.
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Thomas Cech became the first to show that RNA molecules are not restricted to being passive carriers of genetic information, and they can participate in cellular functions.
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Urey Miller experiment was conducted to simulate hypothetical conditions thought to be present on the earth.
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Lynn Margulis formed a theory on the origin of eukaryotic organelles. She contributed to the endosymbiotic theory.
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Fox performed research on the physical structures that may have given rise to the first cells. They formed spontaneously in a lab from solutions of simple organic compounds, including microspheres and coavervates.
