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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.

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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.

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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

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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.
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Video: Role of transport in a cell

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