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Theory Of Spontaneous Generation or AbiogenesisThis is an incorrect theory that was believed for
many centuries.It stated that living things come from nonliving
things.Aristotle said that it explained how life got here. A variety of experiments were performed to
disprove it. Redi proved that maggots come from flies, not meat.http://www.slic2.wsu.edu:82/hurlbert/micro101/images/maggots.gif
BiogenesisAfter many years it was concluded that life comes from life.
Pasteur’s experiment helped to disprove spontaneous generation. facstaff.gpc.edu/.../Microbial%20World.htm
Oparin’s Organic ( Primordial)Soup TheoryHe believed that Earth’s early atmosphere
had the chemical elements necessary to create organic compounds. These elements combined due to static electricity and sunlight and made the first organic compounds. He hypothesized that these organic compounds were the building blocks of the first life forms.
His theory was tested out by Stanley Miller in a lab where he was capable of creating amino acids.
MicroevoultionSmall Changes in a population over time. http://blog.nature.org/wp-content/uploads/2009/02/darwins_finches_by_gould.jpg
MacroevolutionLarge changes over time.Bacteria ManThe first organisms were probably
Prokaryotic ( without a nucleus)Unicellular ( one celled)Anaerobic( They don’t need oxygen)
And they probably lived in the ocean.
Timelinehttp://img340.imageshack.us/img340/1097/jenevo555kb4.jpg