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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.