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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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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.

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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.

Aerial and close-up views of a large biodiversity experiment in Cedar Creek, Minnesota. Each of the Aerial and close-up views of a large biodiversity experiment in Cedar Creek, Minnesota. Each of the
A Possible Problem with the Anger and Concentration Experiment A Possible Problem with the Anger and Concentration Experiment
OraQuick. A negative result would show a red line at the "C" mark, whereas a positive ... OraQuick. A negative result would show a red line at the "C" mark, whereas a positive ...
The Meselson–Stahl experiment proves DNA replicates semiconservatively The Meselson–Stahl experiment proves DNA replicates semiconservatively
Visual Cliff Experiment Visual Cliff Experiment
Experiment: Response to Auxin Experiment: Response to Auxin
Video: Generalized life cycles for plants and animals Animation

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