BIOL 1F90 Lecture Notes - Lecture 20: Devonian, Symmetry In Biology, Abrupt Climate Change
25 Feb 2016
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Chapter 20. 2 - history of life on earth. The universe began with the big bang about 13. 7 billion years ago. Our solar system began about 4. 6 billion years ago. 4 billion years ago the earth cooled enough for outer layers to solidify and oceans to form (made it possible of life of some sort to inhabit earth) 4 billion years ago to 3. 5 billion years ago: first life on earth. Etymology of key terms o o o o o o o o o o. Micro: small; too small to be seen with the naked eye. Learning outcomes o o o o o o o o o o o. Describe 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 fossil records. Review the basic differences between prokaryotes and eukaryotes. Know the theories behind the evolution of eukaryotic cells.
