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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.
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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
![Arrangement of the sarcoplasmic reticulum, transverse tubules, and myofibrils in a single skeletal m](https://biology-forums.com/gallery/47/medium_33_30_07_11_4_15_58.jpeg)
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