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(5 BYA) Sun
The solar system was a switling mass of dust and gas. Once pulled together this formed the sun. -
(4.6 BYA) Planets
Planets formed with the material pulled in by gravity. -
(4 BYA) Rock+ Chemosynthesis
Collisions with Earth caused the surface to melt and when cooling this made rock and crystal. Due to no evidence it's a theory that cells lived through Chemosynthesis. -
(3.5 BYA) Stromatolites
layered structures of stromatolites formed. -
(3 BYA) Photosynthesis
Forms of life became photosynthetic -
(2.2 BYA) Earth
Earth appeared the same as today. -
(2 BYA) Eukaryote
O2 levels reached te levels they are today. Eukaryotic cells evolved which by theory contained membrane bound organells. -
(1.5 BYA) Endosymbiosis
Small aerobic prokaryote was engulfed and began to live and reproduce inside of a larger anareobic prokaryote. (endosymbiosis) -
(1 BYA) Theory of ife
Ozone O3 formed protecting living organisms from harmful UV Rays. Prokaryotic cells chloroplast and mitochondria replicate independently from the replication cycle and contain their own genetic material. -
(1600-1700) Redi and microscopes
Redi observed that maggots turned into flies which would emerge from meat. Also noticed that maggots would appear after adult fly would land somewhere. He did an experiment, and he put beef in two places but put plastic over one and one ended up not having flys appear from it. Also scientist started using microscopes to look deeper inside cells. -
(1700-1800) Strata+Spallanzani
Scientist studied strata and found that the Earth is billions of years old this is when they made a theory called Evolution. Spallanzani designed an experiment to test the spontaneous generation. He then hypothesised that microrganisms formed from some life and not air. He tested this with Broth but failed to succeed. -
(1800-1900) Oparin+Pasteur
Oparin and Haldane thought that the early atmosphere contained ammonia and other gases. They thought that at high temperatures these gases might have formed simple organic compounds such as amino acids. Once Earth formed and lakes and seas were made these organic compounds would have formed in the water. Also, Pasteur took Spallanzanis experiment and modified it with makeing a curve in the flask neck to stop microrganisms from entering. Biogenisis became a main part of biology. -
(1900-Present)
Sidney Fox did extensive research on physical structures that gave rise to the first cells. Then it was discovered they had cell like structures that included microspheres that are composed of protein molecules, they are organized as a membrane and coacervates, this includes lipids, amino acids, and sugars.
