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Unformatted text preview: Theory supported by discovery of DNA, evolution proceeds through mutations Tree of life Mapping genetic relationship has led biologists to discover this new tree of life These genetic studies suggest earliest life on earth resemble bacteria found near deep ocean volcanic vents and geothermal hot springs Miller Urey experiments basic building blocks form easily Life could have migrated to Earth Venus, Earth and Mars have exchanged tons of rocks, blasted into orbits by impacts Some microbes can survive years in space Brief History of Life 4.4 b early oceans form 3.5 B cyanobacteria release oxygen 2.0 oxygen builds up .5 b Cambrian explosion Necessity for Life Nutrient Energy Water...
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- Fall '07