BIO 124 Midterm: Exam 3 Notes (Chapter 23)
16 Mar 2016
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Objectives: overview of the fossil record/how we know what we know, general patterns in the history of the earth, the rise and fall of groups of organisms reflects differences in speciation and extinction rates. Macro evolution: is a term for the collective processes of descent with modification that occur above the level of the species. Trace fossils: marks or structures made by organisms during life (e. g. tracks, burrows) o o. Fossils are almost always preserved in sedimentary rock (rock composted of smaller particles o o o o o o. Anatomy bound together to a greater or lesser degree) Human biases (affecting the information you get from fossils) Easier to find fossils and organisms with mineralized hard parts. Very large organisms may not be completely preserved (e. g. paralititan) Animals that need large areas to sustain themselves (less of them) Much better chance of preservation in marine environments, relative to terrestrial environments. o.
