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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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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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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Medication errors are three times higher among children and infants than with adults.