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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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The average adult has about 21 square feet of skin.