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Chapter 25: The History of Life on Earth

Chapter 25: The History of Life on Earth

Chapter 25: The History of Life on

AP Biology Reading GuideFred and ong>Theong>resa Holtzclawong>Chapterong> ong>25ong>: ong>Theong> ong>Historyong> ong>ofong> ong>Lifeong> on Earthong>Chapterong> ong>25ong>: ong>Theong> ong>Historyong> ong>ofong> ong>Lifeong> on EarthOverviewName _______________________ Period ___________1. In the last chapter, you were asked about macroevolution. To begin this chapter, give someexamples ong>ofong> macroevolution. Include at least one novel example not in your text.Concept ong>25ong>.1 Conditions on early Earth made the origin ong>ofong> life possible2. How old is the planet? __________ How old is the earliest evidence ong>ofong> life on Earth?____________3. ong>Theong> current theory ong>ofong> the origin ong>ofong> life suggests a sequence ong>ofong> four main stages. Summarize themhere.1.2.3.4.4. In your chart above, the first stage is the synthesis ong>ofong> organic molecules. Consider the earlyplanet, probably thick with water vapor and stinky with methane, ammonia, and hydrogensulfide. What gas was missing from this early mix? Why?5. A. I. Oparin and J. B. S. Haldane hypothesized that the early atmosphere was a reducingenvironment. What did they suggest was the source ong>ofong> energy for the early organic synthesis?Copyright © 2010 Pearson Education, Inc. - 1 -

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