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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.