A. A UNIT OF ENERGY SUPPLIED BY FOOD.
A calorie is a unit of energy. Historically, scientists have defined "calorie" to mean a unit of energy or heat that could come from a variety of sources, such as coal or gas. In a nutritional sense, all types of food — whether they are fats, proteins, carbohydrates or sugars — are important sources of calories, which people need to live and function.
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Amino acids are the building blocks of proteins
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the International Amateur Athletic Federation (IAAF)
Over 2,000 years after the earliest Greek track events, in 1912, the International Amateur Athletic Federation (IAAF) was founded to function as the governing body for track and field sports all over the world. Today, as many as 25 events may be included in a track and field meet.
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