BIOL 1F90 Lecture Notes - Lecture 1: Geologic Time Scale, Proterozoic, Hadean
13 Jan 2017
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The universe began with the big bang about 13. 7 bya. Our solar system began about 4. 6 bya. The earth is 4. 55 billion years old. 4 bya the earth cooled enough for outer layers to solidify and oceans to form. (cid:1008) bya to (cid:1007). (cid:1009) bya first life on earth. Bio-: life or relating to living organisms. Micro-: small; too small to be seen with the naked eye. Pre-: earlier than symbiosis: a close association between two organisms. Describe the major environmental changes that have occurred on earth. Describe how fossils are formed and how we know how old they are. Explain the various biases that affect our interpretation of the fossil record. Review the basic differences between prokaryotes and eukaryotes. Know the theories behind the evolution of eukaryotic cells. Place the appearance of prokaryotic and eukaryotic organisms within the four eons of geologic time. List typical environmental changes that influence the emergence and/or disappearance of species.
