This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
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...
View Full Document
This note was uploaded on 12/13/2008 for the course ASTRO 1101 taught by Professor Lloyd,j during the Fall '07 term at Cornell.
- Fall '07