Earth's History timeline

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5 billion years ago the sun ignites image

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4.6 billion years ago Earth formed image

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4.5 billion years ago moon formed image

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3.5 billion years ago first Prokaryotic cells image

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3 billion years ago, photosynthesis began image

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2.7 billion years ago, atmospheric oxygen first appeared image

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2 billion years ago. Eukaryotes first evolve image

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1 billion year ago bacteria appears image

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800 million years ago - Protozoa evolve image

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760 million years ago - Sponges and fungi first appear image

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542 million years ago, first corals appeared image

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541 million years ago - Cambrian explosion occurs image

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510 million years ago - first fish appear image

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425 million years ago - sharks first appeared image

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400 million years ago insects first appear image

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370 million years ago amphibians first appear image

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367.5 million years ago - tetrapods first appear image

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310 million years ago - reptiles first appear image

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247 million years ago dinosaurs first appear image

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200 million years ago, mammals first appear image

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150 million years ago - first birds appear image

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130 million years ago- flowers first appeared image

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120 million years ago - bees first appeared image

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55 million years ago - primates first appear image

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4.4 million years ago - ardipithecus ramidus first appearance image

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1.7 million years ago fire first appears image

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1.6 million years ago - first homosapien image

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5200 years ago - first appearance of writing image

500 million years ago - Ordovician era

400 million years ago - Devonian era

300 million years ago - Carboniferous era

200 million years ago - Jurassic era

100 million years ago - Cretaceous era

Ordovician to Silurian era - decline in population 450 MYA due to climate change/fall in sea level

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

485.4 MYA growth in population during Ordovician era due to marine life/ primate plants

65 MYA population growth during Tertiary era due to rapid evolutionary diversification/ radiation of mammals

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63 million years ago - Creodonta evolve image

200 million years ago - first accepted virus that affected eukaryotic cells image

248 million years ago - greatest mass extinction image

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1.3 billion years ago - earliest land fungi image

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2.3 billion years ago - earth freezes "snowball earth" image

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3.2 billion years ago - diversification/ expansion of acritarchs image

3.5 billion years ago - fossilized bacteria found in Africa image

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3.95 billion years ago - water came to be image

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4 billion years ago - earths surface turns into turmoil of rock and water image

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.