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Look at the word vary in the passage below.
Have you ever wondered why shells come in all different shapes, sizes, and colors? They vary based on the needs of the creatures they protect. Most often, seashells are the exoskeletons of animals like snails, clams, and oysters. The exoskeleton covers these animals' soft, slimy bodies. Snails need shells that let them crawl around. But clams and oysters need shells to keep their whole body protected.
What is the meaning of vary as used in the passage?
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