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Credits Cover: Front Cover: Steve Bloom Images/Alamy; Fritz Poelking/Elvele Images/Alamy; (bkgd) Keren Su/China Span/Alamy. llustration Credits: All illustrations are by Macmillan/ McGraw-Hill except as noted below: 11: (tl) Bob Masheris. 13: (all illustrations) Sam Tomasello. 27: (cr) Patrick Gnan. 40-41: (bc) Patrick Gnan. 59: (c) Left Lane Productions/Corbis. 70: (bl) Jean Wisenbaugh. 71: (tl) Jean Wisenbaugh. 77: (cl) Sam Tomasello. 92: (c) Sam Tomasello. Photography Credits: All photographs are by Ken Cavanagh or Ken Karp for Macmillan/McGraw-Hill (MMH) except as noted below: 1: (cl) Royalty-Free/CORBIS; (cl) John Kaprielian/Photo Researchers, Inc. 2: (c) Ruth A. Adams/Index Stock. 3: (tl) Royalty Free/Corbis; (tr) PhotoLink/Getty Images. 4: (bc) Mark Gibson/Index Stock. 5: (tc) Robert Marien/Index Stock. 6: (bc) Visions of America, LLC/Alamy. 7: (tl) C Squared Studios/Getty Images; (tr) CuboImages srl/Alamy. 8: (bc) Royalty Free/Corbis. 9: (tr) Gary Crabbe/Alamy Images. 11: (tl) Bob Masheris. 12: (c) John Kaprielian/Photo Researchers, Inc. 15: (c) Dale C. Spartas/Corbis; (c) Flip de Nooyer/Foto Natura/Minden Pictures; (c) Dynamic Graphics Group/IT Stock Free/Alamy; (c) Photodisc/Getty Images; (c) Stockdisc/Getty Images. 16: (bc) Lightwave Photography, Inc./Animals Animals. 17: (tl) Jane Shauck Photography/ Alamy; (tr) Flip de Nooyer/Foto Natura/Minden Pictures. 18: (tl, cl) Dynamic Graphics Group/IT Stock Free/Alamy; (bc) Dan Suzio Photography. 19: (cl) Photodisc/Getty Images; (cr) Raymond Mendez/Animals Animals. 20: (cl) Joe McDonald/Corbis; (br) Daniel J Cox/Getty Images. 21: (tc) Art Wolfe/Getty Images. 22: (bcl) Stockdisc/Getty Images. 23: (tr) Royalty Free/ Corbis. 24: (bcl) Bruce Coleman, Inc./Alamy. 25: (tc) Bruce Coleman Brakefield/Alamy. 26: (c) Jane Shauck Photography/Alamy, Darrell Gulin/Corbis, Stockdisc/Getty Images, Raymond Mendez/Animals Animals, Stockdisc/Getty Images, Breck P. Kent/Animals Animals. 27: (cr) Breck P. Kent/Animals Animals, Art W

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