Companies, Inc.; 99 (top right), From Chemistry: Concepts and Applications© Glencoe/The McGraw-Hill Companies,
Inc.; 104 (top centre), Artbase Inc.; 104 (bottom centre), Artbase Inc.; 105 (background), CORBIS/Warren Morgan/
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Biology© 1995 Wm. C. Brown Communications Inc.; 111 (centre), From Anatomy & Physiology The Unity of Form and
FunctionSecond Edition; 112 (bottom left), From Oram, Biology: Living Systems, 1998; 113 (centre left), AP/Wide World
Photos; 114 (bottom left), From Inquiry Into Life 9thed.© 2000, 1997 by McGraw-Hill Companies Inc.; 114 (bottom
left), From Oram, Biology: Living Systems, 1998, Glencoe; 115 (top right), From Inquiry Into Life 9thed.© 2000, 1997
by McGraw-Hill Companies Inc.; 116 (centre), From Inquiry Into Life 9thed.© 2000, 1997 by McGraw-Hill Companies
Inc.; 117 (bottom left), From Glencoe, Biology: The Dynamics of Life© The McGraw-Hill Companies Inc.; 119 (bottom
right), Artbase Inc.; 119 (top right), Richard Megna/Fundamental Photos; 121 (centre right), © David M. Phillips/
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2000, 1997 by McGraw-Hill Companies Inc.; 154 (bottom right), Ian Crysler; 155 (top right), From Inquiry Into Life 9thed.
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Hill Companies Inc.; 199 (centre left), From Raven and Johnson, Understanding Biology© 1995 Wm. C. Brown
Communications Inc.; 201 (bottom right), Artbase Inc.; 208 (bottom left), Photo Researchers, Inc.; 211 (top left), From
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