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Earth's History timeline (((((((((((((((((((((((((((((5200 years ago -…
Earth's History timeline
5 billion years ago the sun ignites 
4.6 billion years ago Earth formed
4.5 billion years ago moon formed
3.5 billion years ago first Prokaryotic cells
3 billion years ago, photosynthesis began
2.7 billion years ago, atmospheric oxygen first appeared
2 billion years ago. Eukaryotes first evolve
1 billion year ago bacteria appears
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2.3 billion years ago - earth freezes "snowball earth"
3.2 billion years ago - diversification/ expansion of acritarchs
3.5 billion years ago - fossilized bacteria found in Africa
3.95 billion years ago - water came to be
4 billion years ago - earths surface turns into turmoil of rock and water
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252 MYA Permian to Triassic era decline in population due to mass extinction, 9/10 species killed,called the "great dying"
66 MYA - Cretaceous to Tertiary era - decline in population due to mass extinction, 3/4 of planet killed off
54 MYA - population growth due to Cambrian explosion, most of the animal phyla showed up
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65 MYA population growth during Tertiary era due to rapid evolutionary diversification/ radiation of mammals
I learned that there were several factors that caused a change in population throughout the course of Earth's history. The first change being a growth in population during the Ordovician era due to marine life/ primate plants developing. Other factors such as mass extinction and changes in sea levels played a role in the constantly changing population too.