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(5 BYA)- And There Was Light
During this time the solar system was a swirling mass of gas and dust. Over time, most material was pulled together by gravity and formed the sun. -
(4.6 BYA)- The Thing We All Have In Common
The Earth was formed during this time through collisions of space debris. -
(4 BYA)- Crystals Fall From A Bright Star
On the Earth, rocks and crystals were beginning to form. Organic molecules also began to accumulate. -
(4 BYA)- Cell Life is Just the Beginning
Archaea are thought to be similar to the types of cellular life that first populated Earth. -
(3.5 BYA)- A Journey of a Thousand Years Begins With A Single Rock
Lynbgya cells often grow in colonies and form layered structures called stromatolites began to form and develop. Life is beginning. -
(3 BYA)- Take A Picture
Some forms of life began to become photosynthetic. -
(2.2 BYA)- Earth Now and Then
Earth for the most part looks the same way it does now. -
(2 BYA)- Breathe Deep
Oxygen levels reach today's levels. -
(1.5 BYA)- Reproduction Begins
Around this time aerobic prokaryote's were beginning to reproduct. -
(1 BYA)- Living On Land
Ozone forms, which protects organisms from harmful UV rays so they can exist on land. -
(1600's)- Microscopes
The first microscope is used to discover that microorganisms are simple in structure and amazingly numerous and widespread. -
(1600's)- Redi's Expierments
He noticed and describe the different developemental forms of flies. -
(1700's)- Spallanzani's Expierements
He designed an expierement to test the hypothesis of spontaneous genereation of microorganisms, -
(Mid 1800's)- Pasteur's Expierement
He made a curved necked flask that allowed the air inside the flask to mix with air outside the flask. The curve in the neck of the flask prevented solid particles from entering the body of the flask. -
(1938)- Lynn Margulis
She proposed that early prokaryotic cells may have developed a mutually bennifical realtionship. -
(Mid 1900's)- Fox
He did extensive research on the physical structures that may have given rise to the first cells. -
(1949)- Radiometric Dating
It is a technique that establishs the age of a material. Scientists can now look at ages of rocks to establish years that thet happened. -
(1952)- Oparin's Hypothesis
He hypothesised at high temperatures gases might have formed simple organic compunds such as amino acids. It would ultimatly have resulted in the macromolecules essential to life such as proteins. -
(1953)- Urey and Miller's Expierement
The tested the hypothesis of Oparin. Their expierement produced a variety of organic compounds including amino acids. -
(1980)- Thomas Cech
He found that a type of RNA found in unicullular eukaryotes is able to act as a chemical catalyst. He used the term Ribozyme for an RNA molecule.
