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BIOLOGY

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  • The Big Bang Theory
  • A popular theory, the Big Bang Theory explains that around 13.7 bya the universe and space expanded, creating our solar system.
  • The Atmosphere The Ozone Layer
  • Earth's atmosphere 4.5bya was mainly composed of volcanic gasses such as: methane, carbon dioxide, ammonia, and no oxygen.
  • Cenozoic: The era we are currently living in, beginning 65 mya to today, we humans originate in this era.
  • The Geologic Timescale
  • Precambrian: The longest era, it is around 87% of Earth's history
  • Earth's history is divided into four, categorized sections or eras. They are organized by the organisms that dominated that era
  • Paleozoic: Referred to as the "Cambrian Explosion" it had a sudden increase in the diversity of living organisms, it lasted 544 to 244 mya.
  • Mesozoic: Lasted 244 to 65 mya, dinosaurs ruled the era until a mass extinction involving an asteroid occurred.
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