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The familiar sounds of your heart are made by the heart's valves as they open and close.
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The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.