Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 19, History of Life - Assessment - Connecting Concepts - Use Science Graphics/Write About Science - Page 568: 34

Answer

Atmosphere on early earth: a. Consisted of carbon dioxide, nitrogen, methane and water vapors b. Frequent volcanic activity c. Frequent bombardment of comets and asteroids Atmosphere nowadays: a. Mainly composed of nitrogen and oxygen b. Less volcanic activity c. Rare comets and asteroids

Work Step by Step

Atmosphere on early earth: a. Consisted of carbon dioxide, nitrogen, methane and water vapors b. Frequent volcanic activity c. Frequent bombardment of comets and asteroids Atmosphere nowadays: a. Mainly composed of nitrogen and oxygen b. Less volcanic activity c. Rare comets and asteroids
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