BIO 1130 Final: Hadean and Archean Eons.doc
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The solar system forms by accretion or attraction of small particles being pulled in which collapses at the centre and creates kinetic heat, forming the sun. Creation of planets with conditions ripe for life to evolve; sets the stage for life. No oxygen at first but bacteria captures energy by splitting water molecules and gives oxygen as a by-product. Most single celled organisms that represent the prokaryotes and eukaryotes. In a very short period of time, multicellular life appears. Can be divided into the paleozoic eon (543-251 ma), mesozoic eon (251-65 ma), and. Dinosaurs become successful cenozoic- cataclysmic event causes dinosaurs disappear; mammals / birds thrive. Mass accumulates with such energy that chemical bonds break and nuclear fusion occurs. 99% of matter in our solar system is in the sun. Fusion of 4 h atoms to form he releasing energy (nuclear fusion reactions) Planets closest to the sun are dense with iron cores (i. e. : earth)