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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)
Collisions between space debris formed Earth and as more collisions occured, the larger Earth became. -
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)
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)
Today stromatolite fossils have been found. Stromatolites are layered structures that form from colonies of cells. -
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)
2.2 billion years agig earth began to form to look like the earth it is today. -
Oxygen Levels Increase (2 BYA)
Oxygen levels began to increase to what the levels are today. -
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 and it protects organisms form harmful UV Rays so they can exsist on land. -
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 beging used mainstrem for reseach. -
Lazzaro Sallanzani
Spallanzani performed an experiment, hypothesizing that microorganisms come from other microorganisms. -
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
Margulis developed the theory of endosymbiosis which theorized that early prokaryotic cells had a mutual relationship -
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
Oparin and Haldane hypothesised that the atmosphere contained ammonia, hydrogen gas, water vapor, and carbon compounds -
Sidney W. Fox
Fox did extensive research cell structure. they included microspheres and coacervates. -
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
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.
