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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.