BIOLOGY 12E CONNECT ACCESS CARD
12th Edition
ISBN: 9781264938513
Author: Raven
Publisher: MCG
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Chapter 25.2, Problem 2LO
Summary Introduction
To describe: The key steps essential for the origination of life.
Introduction: An uncontrollably dynamic environment, which shifts between a frozen and fiery Earth, was implausible to have supported life forms. The early atmosphere of Earth was comprised of CO2 at high levels and it affected the temperature. Over 2 million years, Earth cooled forming silicate clouds. These clouds condensed and rained down, thereby forming the ocean. The level of CO2 in the atmosphere decreased and Earth cooled further. Several times in the history of Earth, all the continents formed a single supercontinent. Over geological time continents moved, and in the Archean eon that followed the first Hadean eon, life forms emerged.
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Chapter 25 Solutions
BIOLOGY 12E CONNECT ACCESS CARD
Ch. 25.1 - Describe the history of the Earth.Ch. 25.1 - Understand the relationship between geological...Ch. 25.2 - Contrast todays atmosphere with the likely...Ch. 25.2 - Prob. 2LOCh. 25.3 - Prob. 1LOCh. 25.4 - Prob. 1LOCh. 25.4 - Prob. 2LOCh. 25.5 - Compare and contrast the evolution of the...Ch. 25.5 - Discuss the types of cell specialization necessary...Ch. 25 - The Miller-Urey experiment demonstrated that a....
Ch. 25 - Plate tectonics can contribute to a. volcanoes and...Ch. 25 - Identify which of the following statements is...Ch. 25 - Which of the following events occurred first in...Ch. 25 - Fossil data indicate that a. life originated 4...Ch. 25 - A global glaciation would be unlikely to occur if...Ch. 25 - Although we do not know how early life arose, the...Ch. 25 - Which bits of evidence would convince you that...Ch. 25 - During which tunes would you expect that...Ch. 25 - The chloroplasts of brown algae a. have a...Ch. 25 - Vascular plants sequestered large amounts of CO2...Ch. 25 - Synthesizing what you have learned in this...Ch. 25 - Prob. 3S
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