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(5 BY A) Sun and Planets are formed
The solar system was just a swirling mass of gas and dust. This material was pulled together to form the sun. Planets formed by many collisions of space debris. Large amounts of thermal energy was released when the planets hit together. This affected the oppurtunity for there to be life on the planets. Life could live now on planets and have heat and light, -
(4.6 BY A) Earth is formed
The earth was formed. This was found out during the middle of the 20th century when modern methods of finding the age of materials was established. This affected everything, because now there was water and land for life to live on. -
(4 BY A) Life and Rocks are forming
Organic molecules began to accumulate. These are the oldest known rocks and crystals. The age of the oldest unmelted surface rock. Cellular life first populated the Earth. Archaea was one of the first life forms on earth. -
(3.5 BY A) Stromatolites in colonies
Lynbgya formed stromatolites in colonies. These archean fossils tell scientists about what happened on the earth and what lived there before anyone was alive. -
(3 BY A) Photosynthetic
Some life forms become photosynthetic. This occurs in many types of plants, algae, and bacteria, but not archaea. This is the process that turns carbon dioxide into organic compounds. -
(2.2 BY A) Carbon Dioxide Levels
There was a lack of oxygen in the atmoshpere. This was proved by fossil soils. The oxygen content in the atmoshpere was one hundredth of what it is today. -
(2 BY A) Oxygen Levels
Oxygen levels reached what they are today, making it possible for humans to live on earth. -
(1.5 BY A) Prokaryote
small aerobic prokaryote was engulfed by a larger one and began to live and reproduce inside of it. -
(1 BY A) Ozone formed
Ozone formed. This protected organisms from harmful UV rays so they could exist on land. -
1600-1700 Leeuwenhoek
Leeuwenhoek made more advanced microscope and looked at living cells for the first time. -
(1700-1800) Spallazani
Spallazani's experiment showed that biogenesis is current principle by boiling broth in flasks. This showed that bacteria comes into the flask from air. -
(1800-1900) Oparin's Hypothesis
Certain gases at high temps. might have formed simple organic compounds. When the earth cooled, these compounds were collected in the water and in later life went through complex chemical reactions to create essential macromolecules. -
(1800-1900) Radiometric Dating
To help scientists figure out time periods and civilization placements. A method to establishing the age of materials. -
(1800-1900) Pasteur's experiment
Principles of biogenesis became became cornerstone of biology in the mid 1800's French scientist. Pasteur boiled broth in a curved flask to prove that "vital force" did not exist. -
(1900-Present) Urey and Miller
Tested Oparin's hypothesis. Though the hypothesis is continually being being revised, this experiement was a milestone in scientific investigation. Stanley Miller (grad student) and Harold Urey (Profressor) American. 1953. -
(1900-Present) Fox
Mid 1900's Sydney. Did extensive research on physical structures of the first cells. -
(1900-Present) Thomas Cech
This was the beginning of RNA discoveries in the world and took place in the early 1980's. Cech found that a type of RNA found in eukaryotes could be a catalyst. He used the term ribozyme for this molecule. -
(1900-Present) Lynn Margulis
In the mid 1900's Margulis proposed that early prokaryotic could have developed mutually beneficial relationships. -
(1600-1700) Redi's experiment
Redi used rottingmeat to show that biogenesis was current principle.
