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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.
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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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Computer programs are available that crosscheck a new drug's possible trade name with all other trade names currently available. These programs detect dangerous similarities between names and alert the manufacturer of the drug.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.