KINE 3P05 Lecture Notes - Lecture 29: Phanerozoic, Carboniferous, Devonian
14 Dec 2017
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Chapter 20. 2 history of life on earth. Our solar system began 4. 6 billion years ago, after one or more local supernova explosions about. 500 asteroids and comets occupied the region where venus, earth, and mars are now found. Earth is 4. 55 billion years old and grew from the accumulation of asteroids and comets over 100 to. Biological evolution genetic changes that occur over one to many generations. Such genetic modifications often lead to dramatic changes in traits and even the formation of new species. Micro small; too small to be seen with the naked eye. Symbiosis a close association between two organisms. The geological time scale a timeline of earth"s history from its origin 4. 55 billion years ago to present. 135 mya flowering plants first appear. 225-200 mya dinosaurs and mammals first appear. 400 mya seed plants first appear; tetropads. 400 mya large terrestrial colonization by. 520 mya first vertebrates; first land plants.
