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Strength

what is muscular dystrophy
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What Is Muscular Dystrophy?

What Is Muscular Dystrophy? Muscular dystrophy is a group of disorders characterized by a progressive loss of muscle mass and consequent los

how do birds fly
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How Do Birds Fly?

Most birds are well suited for flying. First of all, a bird has feathers and wings, and powerful muscles in its breast with which to flap th