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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

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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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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.

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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.

Living systems such as the human body consist of closely interrelated elements Living systems such as the human body consist of closely interrelated elements
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Video: Stroke volume - contractility definition

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