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E-book Mammal Study
When you hear the word “animal,” chances are that you think of a dog, a cat, a bear, or a squirrel. And you’re right, of course. Sometimes, though, the word “animal” is used in its scientific meaning. To a scientist, the word covers a much broader field. It includes insects, birds, fish, amphibians, reptiles, shellfish, worms, and many other living things. In fact, it includes everything that can move on its own power and a few creatures that can’t. The sponge, for example, spends its whole adult life attached to the bottom of the ocean, but it is an animal. Why? Because it does not manufacture its own food. Light in combination with chlorophyll, the substance that gives grass and other vegetation its green color, enables plants to make sugars from water and carbon dioxide.
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