earth formed by a large amount of dust and debris coming together.
4 bya (organic molecules)
organic molecules started to accumulate archae.
4 bya (long time)
700000 times as long a period of recorded history. 50 million times as long as a human life
3.5 bya (stromanict layers)
stromantict layers and fossiales found from 3.5 billion years ago
3 bya (photosynthetic)
forms of life became photosynthetic, this is inffered by trace chemicle evidence.
2.2 bya (earth)
earth started to look the way it is today.
oxegen levels reached todays levels.
small aerobic prokaryotes start to live inside larger anaerobic prokaryotes this was called endosymbiosis
1 bya (ozone)
ozone formed protecting us from uv rays.
Disproved spontaneus combustion (1626)
Francesco redi was first to deny the spontaneus generation theory. Created meat experiment w/ flies
Robert Hooke (1665)
Robert hooke studied nature by using an early light microscope.
Created experiment with a sealed vial of broth and a open vial. proved spontaneus generation
(1872) Louis Pasteur
Won award for clearing up the spontaneus generation theory.
(1894) Soviet Alexander Oparin
Thought that early atmosphere contained ammonia & at high temperatures these gases might have formed simple organic compounds such as amino acids
(1900s) Lynn Marulis
okaryotic cells may have developed a mutually beneficial relationship.
(1953) Urey and Miller
Concluded that organic compounds might only have been possible in areas protected from the atmosphere, such as undersea hot springs.
Sidney Fox did extensive research on physical structures that could have given rise to the first cells. These structures are microspheres and coacervates.
(1980s) Thomas Cech
Thomas Cech discovered ribozymes. RNAs molecule that can act as a catalyst and promote a specific chemical reaction. His findings support the hypothesis that life could have started with self-replicating molecules of RNA