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(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
Organic molecules began to accumulate. Oldest known rock and crystals are from this time -
(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
Some forms of life had become photosynthetic -
(2.2BYA)Earth
Earth appears how it would look like now -
(2BYA) O2
O2 levels reached today's levels -
(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
