Sidewalk Science: The History of Life on Earth

on

 12/22/23

  • Sidewalk science

    • Universe formed 13.8 Billion years ago

    • Earth formed 4.5 Billion years ago

    • History of Life

      • Life form Years ago

      • First Life/Bacteria - 3.5 billion years ago

      • Invertebrates - 600 m years ago

      • Vertebrates - 525 m years ago

      • Land Plants - 500 m 

      • Trees - 385 m

      • Insects - 385 m

      • Dinosaurs - 230 m

      • Mammals - 200 m

      • Flowers - 140 m

      • Grass - 55 m

      • Primates - 60 m

      • Humans - 300 k






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