Chapter 25 Slides Sections 1-3
Chapter 25 Slides Sections 1-3 Chapter 25 Slides Sections 1-3
How Rocks and Fossils Are Dated • Sedimentary strata reveal the relative ages of fossils • The absolute ages of fossils can be determined by radiometric dating • A “parent” isotope decays to a “daughter” isotope at a constant rate • Each isotope has a known half-life, the time required for half the parent isotope to decay AP Biology © 2011 Pearson Education, Inc.
Fraction of parent isotope remaining Figure 25.5 Accumulating “daughter” isotope 1 2 1 4 1 8 1 16 Remaining “parent” isotope AP Biology 1 2 3 4 Time (half-lives)
- 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: • Few individuals have fossilized
- 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
- Page 31 and 32: Figure 25.UN03 1 4 2 3 AP Biology A
- Page 33 and 34: • By about 2.7 billion years ago,
- Page 35 and 36: Figure 25.UN04 1 4 AP Biology Singl
- Page 37 and 38: First Eukaryotes • Development of
- Page 39 and 40: 2 nd Endosymbiosis • Evolution of
- 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
- Page 49 and 50: The Colonization of Land • Fungi,
- Page 51: Is there life elsewhere? Does it lo
How Rocks and Fossils Are Dated<br />
• Sedimentary strata reveal the relative ages of<br />
fossils<br />
• The absolute ages of fossils can be<br />
determined by radiometric dating<br />
• A “parent” isotope decays to a “daughter”<br />
isotope at a constant rate<br />
• Each isotope has a known half-life, the time<br />
required for half the parent isotope to decay<br />
AP Biology<br />
© 2011 Pearson Education, Inc.
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