Chapter 25 Slides Sections 1-3

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(percent of present-day levels; log scale) Figure <strong>25</strong>.8 1,000 100 Atmospheric O 2 10 1 0.1 0.01 “Oxygen revolution” 0.001 0.0001 4 3 2 1 0 Time (billions of years ago) AP Biology
Figure <strong>25</strong>.UN04 1 4 AP Biology Singlecelled eukaryotes 2 3
Page 1 and 2: “…sparked by just the right com
Page 3 and 4: Concept 25.1: Conditions on early E
Page 5 and 6: • In the 1920s, A. I. Oparin and
Page 7 and 8: Conditions on early Earth AP Biolog
Page 9 and 10: Stanley Miller University of Chicag
Page 11 and 12: Abiotic Synthesis of Macromolecules
Page 13 and 14: • Adding clay can increase the ra
Page 15 and 16: Self-Replicating RNA and the Dawn o
Page 17 and 18: The Fossil Record • Sedimentary r
Page 19 and 20: • Few individuals have fossilized
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Page 23 and 24: Concept 25.3: Key events in life’
Page 25 and 26: Table 25.1 AP Biology
Page 27 and 28: Table 25.1b AP Biology
Page 29 and 30: Figure 25.7-3 Cenozoic Humans Colon
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Page 33: • By about 2.7 billion years ago,
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Page 41 and 42: Figure 25.UN05 1 4 2 3 AP Biology M
Page 43 and 44: Figure 25.UN06 Animals 1 4 2 3 AP B
Page 45 and 46: AP Biology
Page 47 and 48: Figure 25.10 Sponges Cnidarians Ech
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Page 51: Is there life elsewhere? Does it lo

Chapter 25 Slides Sections 1-3

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