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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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You should not take more than 1,000 mg of vitamin E per day. Doses above this amount increase the risk of bleeding problems that can lead to a stroke.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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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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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
![Relationship between fruit radius and beak length in populations of native and introduced species of](https://biology-forums.com/gallery/47/medium_33_31_08_11_2_12_19_16231398.jpeg)
![Brushing off to finish-back. In a quiet voice ask the person to sit up with legs off the side of the ...](https://biology-forums.com/gallery/33/medium_380798_23_08_17_11_07_33_336031888.jpeg)