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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.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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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.