Answer:
Nutrient. Nutrients are chemical compounds in food that are used by the body to function properly and maintain health. Examples include proteins, fats, carbohydrates, vitamins, and minerals. Source: National Institutes of Health, Office of Dietary
Your heart beats on average from about 60-100 beats per minute.
The line of immune defense that was broken was the skin. It might not look helpful but it's a very important part of the body.
Pretty sure it’s studies because you read textbooks to learn more about the subject. So B.Studies
