978-1-4222-3405-1
P hoto C redits
Dollarphoto.com: Julija Sapic 8; 22; Goldencoinz 24
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PBWorks: 13
ExoTerra: 32
National Library of Medicine: 17
Newscom: Sara-Jane Poole 29
Shutterstock: Moments by Millineux 28
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