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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The average adult has about 21 square feet of skin.