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29 Lecture Plant Diversity i

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  LECTURE PRESENTATIONS  For CAMPBELL BIOLOGY, NINTH EDITION   Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson © 2011 Pearson Education, Inc. Lectures by Erin Barley Kathleen Fitzpatrick Plant Diversity I: How Plants Colonized Land Chapter 29  Overview: The Greening of Earth ã For more than the first 3 billion years of Earth ’ s history, the terrestrial surface was lifeless ã Cyanobacteria likely existed on land 1.2 billion years ago ã  Around 500 million years ago, small plants, fungi, and animals emerged on land © 2011 Pearson Education, Inc.  ã Since colonizing land, plants have diversified into roughly 290,000 living species ã Land plants are defined as having terrestrial ancestors, even though some are now aquatic ã Land plants do not include photosynthetic protists (algae) ã Plants supply oxygen and are the ultimate source of most food eaten by land animals © 2011 Pearson Education, Inc.  1 m Figure 29.1
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