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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

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Everyone has one nostril that is larger than the other.

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Your heart beats over 36 million times a year.

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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

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According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.

Approach used to determine the evolutionary relationships among many animal species using molecular Approach used to determine the evolutionary relationships among many animal species using molecular
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Four approaches to studying the evolution of human behavior. Four approaches to studying the evolution of human behavior.
Stages of Human Development Stages of Human Development
Regulatory mutations of the human -globin gene Regulatory mutations of the human -globin gene
Video: Labor and Childbirth - The Three Stages of Labor: Dilation, Expulsion & Placental مراحل الولادة

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