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<span>The correct answer is true; insufficient flexibility does indeed increase an athlete's risk of an injury. This is because a less flexible muscle is more likely to be pulled or torn by movement than one that is able to be moved in a greater range of motion. Thus, it is important for athletes to work of their flexibility.</span>
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.
