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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The human body produces and destroys 15 million blood cells every second.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.