The Earth

  • Creation of the Sun (5BYA)

    Creation of the Sun (5BYA)
    The solar system was a mass of swirling gas and dust. Overtime gravity pulled the gas and dust to make the sun.
  • Creation of Earth (4.6)

    Creation of Earth (4.6)
    Collisions between space debris formed Earth and as more collisions occured, the larger Earth became.
  • Earth's Age (4BYA)

    Earth's Age (4BYA)
    Scientists estimate the earth to be about 4 billion years old. By studing sedimentary rocks an minerals, they are able tom ake an educated guess.
  • Anaerobic, Heterotrophic, and Prokaryotes (4BYA)

    Anaerobic, Heterotrophic, and Prokaryotes (4BYA)
    Little to no oxygen existed on earth. The first living cells were anaerobic, heterotrophic, and prokaryotes that ate organic molecules for food.
  • Stromatolite Fossils (3.5 BYA)

    Stromatolite Fossils (3.5 BYA)
    Today stromatolite fossils have been found. Stromatolites are layered structures that form from colonies of cells.
  • Forms of Life Become Photosynthetic (3 BYA)

    Forms of Life Become Photosynthetic (3 BYA)
    Scientists infer that forms of life became photosynthetic, because of chemicle evidence.
  • Earth's Evolution (2.2 BYA)

    Earth's Evolution (2.2 BYA)
    2.2 billion years agig earth began to form to look like the earth it is today.
  • Oxygen Levels Increase (2 BYA)

    Oxygen Levels Increase (2 BYA)
    Oxygen levels began to increase to what the levels are today.
  • Endosymbiosis (1.5 BYA)

    Endosymbiosis (1.5 BYA)
    A theory suggest that a type of small aerobic prokaryote was swallowed by a larger anarerobic prokaryote and began to live inside the bigger cell. This theory is called endosymbiosis.
  • Ozone is Formed

    Ozone is Formed
    Ozone is formed and it protects organisms form harmful UV Rays so they can exsist on land.
  • Francesco Redi

    Francesco Redi
    Redi noticed the development stages of flies and performed an experiment and discovered that the theory of spontaneous regeneration was false.
  • The Microscope

    The Microscope
    The microscope beging used mainstrem for reseach.
  • Lazzaro Sallanzani

    Lazzaro Sallanzani
    Spallanzani performed an experiment, hypothesizing that microorganisms come from other microorganisms.
  • Louis Pasteur

    Louis Pasteur
    Pasteur cleared up the controversy of spontaneous generation by performing an experiment. He won a prize from the Paris Academy of Science.
  • Lynn Margulis

    Lynn Margulis
    Margulis developed the theory of endosymbiosis which theorized that early prokaryotic cells had a mutual relationship
  • Thomas Cech

    Thomas Cech
    Cech discovered a kind of RNA in unicellular eukaryotes that acts as a catalyst. He referred to it as a ribozyme.
  • Alexander I. Oparin and Jhon Haldane

    Alexander I. Oparin and Jhon Haldane
    Oparin and Haldane hypothesised that the atmosphere contained ammonia, hydrogen gas, water vapor, and carbon compounds
  • Sidney W. Fox

    Sidney W. Fox
    Fox did extensive research cell structure. they included microspheres and coacervates.
  • Stanley Miller and Harold Urey

    Stanley Miller and Harold Urey
    Miller and Ustanley rey preformed an experiment using Oparin’s hypothesis that Earth’s gases would form simple organic compounds at high temperatures.
  • Radio Metric Dating

    Radio Metric Dating
    Radiometric dating was used to determine the age of various objects. This is completed by measuring the quantity of a specific radioactive isotope in an object.