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Going back to the latest carbon dated rocks it is estimated that the Earth formed 4.6 billion years ago.
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4 billion years ago bacteria formed that were able to withstand the extreme environment of the Earth.
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3.5 Billion years ago oxygen was created first by photosynthesis
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Single celled organisims started off simple but as time passed on they would combine together and evolve into multicellluar organisims.
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Eukaryotes first evolved by obtaining a symbiotic relationship with other microrganisims. They engulfed them and gained their properties and specalities.
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About 83% of all life was wiped out. Glaciation and rising sea levels are noted to be the most influential causes of this extinction.
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It is estimated that 75% of life was wiped out during this period. The heartyness of the creatures that survived actually helped form the first homosapiens. Without it we may not have been here today
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Pangaea forms and most land on Earth is all together as one big supercontinent.
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This is considered the worst extinction on Earth to this day. Over 96% of all life was exterminated by volcanoes.
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The massive supercontinent, Pangaea, breaks apart and splits into our modern day continents.
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It is believed that during this short peroid, there were many stages of the extinction. asteroid impact, climate change, and flood basalt eruptions are all to blame for it.
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Probably the most well known extinction, the Cretaceous–Paleogene extinction wiped out the dinosaurs. However it allowed for the evolution of mammals to live on land and on sea
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Humans first evolved into the people we are today about 7 millon years ago. However it wasn't till about 3 million years ago that we first started to use rock tools.
