BIO 1150 1st Edition Lecture 1All organisms are different and that occurred because of evolution- Evolution- descent with modification and (or) natural selection- There are 1.4 million different known species and an estimated 30 million unknownThis diversity is not evenly distributed throughout the world- This is based on environmental factors ie. Seasons, climate etc.- More diverse around the equatorEarth is billion years old, eras organize this time (see Table 25.1)- We know this because of fossils and how they are dated- Fossils are dated by sedimentary strata and radiometric datingContinental Drift- the movement of continents because of tectonic plates shifting- Pangaea’s Effects (250 million years old) - Ocean basins getting deeper- Reduction in shallow water- Colder/drier climateBiodiversity- balance between speciation and extinction- Speciation- the process of new species forming due to evolution- Extinction-end of a group of organismsThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Side Notes Discussed in Class- Permian extinction- period when 90% of marine organisms when extincto Possible causes- comet or atmosphere change- KT boundary- the end of cretaceous and beginning of quaternary- The extinction of dinosaurs lead to the diversification of mammals- Cambrian Explosion- new phyla- caused environment changeNote: Reading the chapters will greatly increase your understanding of each topic.Works CitedGoldstein, David. "1150 History of Life to Post." Pilot.wright.edu. Wright State University, 12 Jan. 2015. Web. 27 Jan. 2015.Goldstein, David. BIO 1150-01 Organisms and Ecosystems. Wright State University. Fairborn, Ohio, 14 Jan. 2015.
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