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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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The human body produces and destroys 15 million blood cells every second.
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Inotropic therapy does not have a role in the treatment of most heart failure patients. These drugs can make patients feel and function better but usually do not lengthen the predicted length of their lives.
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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.