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5 BYA Solar System was Created
The solar system was a swirling mass of gass and dust. -
4.6 BYA Earth Grew
The Earth grew larger due to gravity pulling in more debris. A larger earth would eventually be able to withhold microorganisms and soon humans. -
4 BYA Age of Earth
The estimated age of Earth is about 700,00 times as long as the period of recorded history. -
4 BYA Accumulation of Molecules
Organic molecules began to accumulate such as archae. This was the start of life as we know it, -
3.5 BYA
Lynbgya cells make layered structures called stromatolites. Fossils of Stromatolites were found. These were early cells that would evolve into new organisms. -
3 BYA Photosynthesis
Some forms of life adapted to the way of the Earth and become photosynthetic. -
2.2 BYA Appearance of Earth
Even though it was billions of years ago the Earth appeared as it does today. This shows that even as life changed the Earth still remained almost the same. -
2 BYA Oxygen
The Earth's oxygen levels reached the levels that are present today. This would be able to support living things on Earth. -
1.5 BYA Prokaryotes
A type of small prokaryote was engolfed by and began to live and reproduce inside of a longer anaerobic prokaryote-endosmbiosis. -
1 BYA Ozone Layer
Ozone (O3) was formed. It protected organisms from harmful UV rays so they could exist and dwell on land. -
1600-1700 Spontaneous Generation Questioned
Redi noticed different developmental methods of flies and people began to question the common belief of spontaneous generation. -
1800-1900 Controversy Continues
Paris Academy of Science offered a prize to whomever could clear up the controversy entirely; Pasteur's experiment won. He found that a flask with a curved neck will not become contaminated, but one without a neck will contaminate within days. -
1700-1800 Spallanzani's Experiments
Spallanzani wanted to test out the theory of spontaneous generation of microorganisms. He boiled fresh clear broth in two flasks and left one open and the other one closed, The one that was left open became cloudy and the one that was closed remained clear. -
1900-Present Oparins Hypothesis
Oparins hypothesis: At high temperatures gases might have formed simple organic compounds. -
1900-Present Fox
He did research on the physical structures that may have given rise to the first cell. -
1900-Present Cech
Discovered that a type of RNA is able to act as a chemical catalyst. -
1900- Present Margulis
Discovered that early prokaryotic cells might have developed a mutually beneficial relationship. -
1900- Present Microscopes
Early microscopes showed that the world is abundant with tiny creatures. They also showed that microorganisms are simple in construction and are numerous and widespread. Redi used the microscope for his experiments. -
1900-present Urey and Miller
This grad student and professor set up an experiment to test the hypothesis of Oparin. They set up chambers with the gases that were assumed to be present in the earths atmosphere. When these gases came together they made sparks the symbolized lighting which gave energy for chemical reactions.
