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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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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

Why people don't stop smoking Why people don't stop smoking
Growth Chart for American Girls From Birth Through Age 3 Growth slows from infancy to toddlerhood b Growth Chart for American Girls From Birth Through Age 3 Growth slows from infancy to toddlerhood b
Carrie Mae Weems, Untitled (Man Smoking/Malcolm X), from The Kitchen Table Series. Carrie Mae Weems, Untitled (Man Smoking/Malcolm X), from The Kitchen Table Series.
This couple, a brother and sister in Germany and the proud parents of this child, are challenging ... This couple, a brother and sister in Germany and the proud parents of this child, are challenging ...
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Lakeridge Health Oshawa is a 423 beds hospital with 463 doctors and 4058 staff comprised of ... Lakeridge Health Oshawa is a 423 beds hospital with 463 doctors and 4058 staff comprised of ...
Video: Glycolysis - and oxygen

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