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(5 BYA) Birth of the Sun
Sun forms from a cloud of gas. -
(4.6 BYA) Formation of Solar System
The solar system was formed from swirling masses of gas and dust. Matieral was held together by gravity and the sun was created. -
(4 BYA) Earth is Created
Earth was created, discovered by examining the layers in Earth's crust. -
(4 BYA) Organic Molecules begin to accumulate
This was discovered because the oldest rocks and crystals are around 4 billion years old. -
(3.5 billion years ago) Stromatoliktes are made
Stromatolites, which are layered structures that prokaryotic cells form, are created. -
(3 Billion years ago) Photosynthetic life comes along
Chemical traces of photosynthetic activity were foud. OPldest known fossils of cells are similar to cyanobacteria, photosynthetic unicellular prokaryotes. -
(2- 1.5 BYA) Thoery of Endosymbiosis
When a small type of aerobic prokaryote was eaten by and began to reproduce inside a larger anaerobic. The eukaroyptes formed from prokaryotes. Endosymbiti aerobic prokaryotes envolved into modern mitochondria. -
(1 BYA) Ozone Formed
Ozone (O3) was formed whcih protected organisms from harmful UV rays so they could exsist on land. -
(1600s) Redi's Experiment
In the 1600's, Franciso Redi, believed spontaneous generation was incorrect and disproved this theory by proving flies came from eggs using a closed jar and an open jar, seeing that flies were not randomly produced (in the closed jar). -
(1900s) Experiment of Organic Compounds
Miller and Urey were two scientists who made an experiment to prove Halden and Oprain's hypothesis. They created an apparatus that included a chamber containing gasses that were thought to be in the earth's atmosphere. The experiment proved the scientists' hypothesis correct. -
RNA Roles (1900's)
Thomas Cech researched and found that a type of RNA can work as an enzyme. He labeled this term Ribozyme . He also foud that RNA placs a huge role in DNA replication. -
Frist Eularyotes (1900's)
Lynn Margulis founnd that early eukaryotes had a mutuall relationship. 2.0-1.5 billion years ago a small type aerobic prokaryote was eaten by a began to reproduce inside a larger anearobic prokaryote. This theory is called endosmbiosis. -
(1800s) Pasteur's Experiment
Pasteur won the Paris Academy science award by clearing the issue of spontaneous generation. He proved this by using Spallanzani's experiment but using a flask with a curved neck so solid particles could not come in. Unbent flask had microorganisms growing in it. -
(1900s) Discovery of Formation of Organic Compounds
Oparin and Halden thought that the early atmosphere contained hydrogen gas, ammonia, water vapor, and compounds like carbon and methane. When the gasses were heated, they formed simple organic compounds and an example is amino acids. -
Organic Compunds from Outside Earth (1970)
Scientists hypothesized that debirs from space came into Earth's atmosphere and contaied other organic compounds. These compounds were in a fallen meterorite. This is how were have all different organic compounds, because some come form space. -
First Cell-Like Structures (1900's)
Sidney Fox and other scientists did erasearch on the cell structure of the first cell. The structures include microspheres and coacervates. Microshperes and coacervates ca both spontaneously under certain conditions. The studies suggest that the gap between the nonliving chemical compond and cellular life may by closer than we think, -
(1700s) Spallanzani's Experiment
Tried to prove the theorm of spontaneous generation incorrect by using broth. He boiled broth and then closed one jar and kept one open. The open one became cloudy due to microorganism growth, the closed one stayed clear. He concluded that microorganisms entered by the air.
