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(5BYA) Solar System
Solar system occured and the sun began to form by material. -
(4.6) earth
Earth began to form by colliding with space debris. -
(4BYA) Organic molecules
organic molecules accumulate old rocks and crystals -
(4BYA) Archaeal species
Archael species populated earth like the cellular life did when earth began. -
(3.5BYA) Stromatolites
lynbgya cells grew and formed stromatolites. -
(3BYA) photosynthesis
some forms of life became photosynthetic. -
(2.2BYA) Earth
earth appeared much as it is to this day. -
Period: to
(2/1.5BYA) Endosymbiosis
Aerobic prokaryote was engulfed and began to live and reproduce inside of a larger anerobic prokaryotes. (Endosymbiosis) -
(2BYA) oxygen
oxygen levels reached todays level. -
(1BYA) ozone layer
Ozone layer formed to protected organisms from harmful UV light. -
1600's - 1700's Redi
Redi tested the priniciple of bigenesis by having an open container with meat inside, and a closed container with meat inside to see if the meat produces maggots. -
1600's - 1700's microscopes
Scientist began to use microscopes. -
1700's - 1800's Spallanzani
Spallanzani's experiment tested the spontaneous generation and found out that microorganisms are created by other microorganisms. -
1800's - 1900's Pasteur
Pasteur developed an experiment that showed biogenesis is true and spontaneous generation was false. -
1900's - Present oparin
Oparin develeped a hypothesis about the conditions for formation of organic molecules on early earth. -
1900's - presents urey and miller
Urey and miller formed an experiment to test oparin's hypothesis on all the gases that he thought made up organic compounds. -
1900's - present Fox
Sydney Fox did research and found the physical structures that may have began the rise of the 1st cells. -
1900's - present radiometric dating
invented radiometric dating to find out or establish the age of materials from early earth. -
1900's - present lynn
Lynn Margulis proposed a theory that early prokaryotic cells may have developed a relationship which is endosymbiosis. -
1900's- Present Cech
Thomas cech found a RNA in an unicellular eukaryote and acts as a chemical catalysts.
