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(5BYA) Five Billion Years
The Solar system was a swirling mass of gas and dust. Most of the material over time was pulled together by gravity and formed the sun. -
(4.6 BYA) 4.6 Billion Years ago.
The Earth grew larger as gravity pulled more debris. the collisions between the Eath and the space debris also released a great deal of thermal energy, -
(4 BYA) 4 Billion Years
Scientists have explored the Earth's surface and examined its many layers of sedimentrat rocks in Earth's crust. -
(4 BYA) 4 Billion Years
The Earth is around fifty million times as long as the normal life expectancy. Organic molecules are beginging to accumulate and the Archea are thought to be similar to types of cellular life that have populated the Earth at this time. A technique used was Raiometric Dating, which was used to establish the age of materials using the atomic number of the elements of the isotopes. -
(3.5 BYA) 3.5 Billion Years
Cyanobacteria was discoveres unicellular prokaryotes, fossils of sreomatolies, oxygen, which was a byproduct of photosynthesis, which was harmful to many of the unicellular organisms -
(3 BYA) 3 Billion Years
There started to be Photosynnthetic forms of life -
(2.2 BYA) 2.2 Billion Years
The Earth appeared as much as it does today. -
(2 BYA) 2 Billion Years
The Oxygen levels reached the levels that they are today. -
(1.5 BYA) 1.5 Billion Years
A type of small aerobic prokaryote was engulfed and began to live and reproduce inside an anaerobic prokaryote -
(1 BYA) 1 Billion Years)
Ozone (O3) formed. This protected organisms from harmful UV rays so tgey coukd exist on land -
(1626-1697) Between the 1600's -1700's
The microscope was starting to be used to observe different orangisms. This helped reveal that the world had many creatures living in it. This also showed that there organisms were very simole structured creatures and were very numerous and widespread. -
(1626-1697) Between 1600's and 1700's
Francesco Redi noticed and described the difference in gorwth of different forms of flies. He made observations coming to the conclusion that flies/maggots aren;t produced from rotting meat. -
(1665) Between 1600's and 1700's
Hooke invented the light microscope Redi did an experiment on rotting meat. -
(1729-1799) Between 1700's and 1800's
Spallanzani showed the world that air is lacking a "vital force" and couldn't generate life. This kept the spontaneous generations of microorganisms alive for another generation. -
(1729-1799) BEtween 1700's and 1800's
Lazzaro Spallanzani had the hyppthesis that microorganisms were created not from the air but from other microorganisms. He concluded that boiled broth only became contaminated when microorganisms from the air entered the flask. -
(1822-1895) Between the 1800's and 1900's
People learned that the reason the air was contaminated ws due to the organisms in the air. -
(1822-1895) Between the 1800's and 1900's
Louis Psteur set up his prize-winning experiment creating a flask with a curve in the neck to prevent solid particles, like microorganisms from entering into the body of the flask. -
(1900's) Between the 1900's and present
All of the elements found in organic compounds are thoguht to have existed on Earth and in the rest of the Solar system when the Earth was formed. -
(1920's) Between the 1900's and present
Oparian thought that the early atmosphere contained ammonia, hydroge, water vapor, and other compounds such as methane -
(1960's) Between the 1900's and the present
Lynn Margulis proposed a new theory that said that cellular organelles were the result of Endosymbiosis. -
(1953) Between the 1900's and Present
Stanely L. Miller and Harold C. Urey started an experiment using Oparins hypothesis. This produced a variety of organic compunds, like amino acids. -
(1980's) Between the 1900's and Present
Thomas Cech discovered that RNA can act as a chamical catalyst just like the way an enzyme acts. -
(1950's) Between the 1900's and Present
Scientists have revised earlier hypothesis and combined chemicals and energy to make a variety of ornagic compunds. -
(1998) Between the 1900's and the Present
Fox did extensive research on the physical structures that may have given rise to the first cells.
