COYNE CH2

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Department
Biology
Course
BIO120H1
Professor
Jean Jiang Nash
Semester
Winter

Description
Chapter 2: Written In the Rocks Making the Record Process: reach bottom of water; get covered by sediments (thus, rare fossils of dead plants and land animals); soft parts arent preserved causing a bias (explains lack of worms and jellyfish fossils); many are too buried in the earths surface to reach and many lost to natural forces like weather. Thus, fossil records severely incomplete. Relative age Layers dictate age, but not all layers laid down in one place. Must therefore cross-reference. (Same type of rock with same type of fossil= same age) Actual ageradioactivity. Different isotopes decay at different rates. (Radiometric dating) The Facts: Evidence of Evolution in Fossils 1) Early life simpler than complex modern life 2) Visible connected changes in lineage; most modern fossils have similar traits to living organisms 3) Transitional species in fossils (Darwin did not have this) transition ancestor differs in some respect to all descendants (not an intermedi
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