History of Life

Timeline created by phoebelser
  • 5 BYA

    5 BYA
    Solar system began to form
  • 4.6 BYA

    4.6 BYA
    The Earth began its formation. It grew by colliding space debris.
  • 4 BYA

    4 BYA
    Volcanoes attmitted gas which formed to create the atmosphere
  • 4 BYA

    4 BYA
    Methanosarcin barkeri
    Produces methane during metabolism, Archaea are thought to be similar to the types of cellullar life that first populated life.
  • 3.5 BYA

    3.5 BYA
    Lynga Cells
    Fossils of stromatolites are are found as old as 3.5 BYA, the lyngya cells grew in layers called stromatolites. Lyngya cells are prokaryotic cells, theat a photosynthetic, and unicellular
  • 3 BYA

    3 BYA
    Some forms of life had become photostnthetic.
  • 2.2 BYA

    2.2 BYA
    Earth appeared much as it does today
  • 2 BYA

    2 BYA
    O2 levels reached today's levels
  • 1.5 BYA

    1.5 BYA
    Aerobic Prokaryote
    Type of aerobic prokaryote was engolfed by and began to live and reproduce inside of a larger, anaerobic prokaryote. Theory is called Endosymbiosis.
  • 1 BYA

    1 BYA
    Ozone (O3) formed – protected organisms from harmful UV rays so they could exist on land
  • 1668

    1668
    Redi's Experiment
    Large amounts of the worlds carbon 14 decayed, Redi realized that when he allowed flies in his meat maggots appeared, and when he didn’t no maggots appeared
  • 1700-1800

    1700-1800
    Spallazani's Experiment
    Spallazani realized that when you seal the glass container of broth it remains clean, but when you leave it open bacteria appears.
  • 1800-1900

    1800-1900
    Pasteur's Experiment
    Pausture used curve necked beekers to show that gravity causes microorganisms to fall in, they do not just appear.
  • 1900- Present

    1900- Present
    Lynn Margullis proposed that early prokaryotic cells may have developed a mutually benificial relationship.
  • 1659 Thomas Crech

    1659 Thomas Crech
    Found type of RNA the is found in some unicellular eurokatyotes to act as a chemical catalyst
  • Urey and Miller

    Urey and Miller
    Set up experiments to test oparin's hypothesis
  • Fox

    Fox
    Did extensive research on physical structures that may have given rise to the first cells
  • Radiometric Dating

    Radiometric Dating
    Techniques that can determine a range of plausibe dates for how old objects are. This is how they found out how old the earth is
  • Lynn Margulis 1938

    Lynn Margulis 1938
    Proposed that earlier prokaryotic cells may have developed a mutually beneficial relationship
  • First Microscopes 1590

    First Microscopes 1590
    Light Microscope that used optical lenses to magnify objects by bending light rays
  • Oparin's Hypothesis

    Oparin's Hypothesis
    Stated how and where elements were assemble into organic compounds. Died before he ever got to test it