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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
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.
Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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.
More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.