4, Richards and nguyen. start of a new world

  • (5BYA) solar system

    (5BYA) solar system
    Solar system was a swirling mass of gass and sun began to form
  • (4.6BYA)Earth

    earth began to form
  • (4BYA) Organic Molecules

    (4BYA) Organic Molecules
    Organic molecules began to accumulate. Oldest known rock and crystals are from this time
  • (4BYA) Scientist

    (4BYA) Scientist
    scienctist infer that organic molecules began to accumulate
  • (3.5BYA)Fossils

    Fossils of stromatiltes as old as 3.5 bya are known
  • (3BYA)Forms of life

    (3BYA)Forms of life
    Some forms of life had become photosynthetic
  • (2.2BYA)Earth

    Earth appears how it would look like now
  • (2BYA) O2

    (2BYA) O2
    O2 levels reached today's levels
  • (2BYA-1.5BYA) aerobic prokaryote

    (2BYA-1.5BYA) aerobic prokaryote
    A type of small aerobic prokaryote was engulfed by and beagan to live and reproduce inside a larger prokaryote Theory called endosynbiosis
  • (1BYA)Ozone

    Ozone(o3) formed-protected organisms from harmful UV rays So they could exist on land
  • 1600-1700

    Redi's Experiement observed tiny wormlike maggot, from which flies emerge Redi tested the principle of biogenisis Microscope-scientist started using them same time redi did his experiment
  • 1700-1800

    Spallanzis experiement tested hypothesis of spontaneous generation of microorganisms
  • 1800-1900

    pasteur's experiment-won a prize for clearing up spontaneous generation
  • 1900-present

    Lynn margulis-early prokarytic cells may develop a mutually beneficial relationship
  • 1900-present

    Thomas Cech-Found out that RNA found in a unicelluar Eukaryote acts as a chemical catalyst
  • 1900-present

    Fox- Done extensive research on the physical structures that have given rise to the first cell
  • 1900-present

    Radioactive dating- method of establishing the age of material
  • 1900-present

    Urey and Miller- Test Oparin's hypothesis and made compunds such as amino acids that are found in water.
  • 1900-present

    Oparin's hypothesis- thought that early atmosphere cpntained ammonia