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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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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
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Everyone has one nostril that is larger than the other.
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In 2010, opiate painkllers, such as morphine, OxyContin®, and Vicodin®, were tied to almost 60% of drug overdose deaths.