Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
Orientation of the Central Engine and Its Jets
Although males tend to be larger than females, the two overlap significantly in size. The size of a