What Is the Animal Kingdom? (The Science of Living Things)

Kalman, Bobbie; Smithyman, Kathryn

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9780865058774: What Is the Animal Kingdom? (The Science of Living Things)

Synopsis

Introduces the animal kingdom, showing and describing the main groups of animals and discussing their anatomy, habitats, reproduction, and classification

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Taken from Chapter 8: Fish built for swimming A fish's body is made up mostly of powerful muscles that are used for swimming. Fish swim by moving their body from side to side. Some swim slowly by moving their fins. Most fish, however, use their fins only to steer and keep themselves from rolling onto their side as they swim. Almost all fish have a swim bladder, a balloon-like organ that helps them float. When a fish lets air into its swim bladder, its body rises in the water. When it lets in water, its body sinks.

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