The organs involved in digestion contain what to make their walls move? A) muscles B) nerves C) proteins D) carbohydrates

During exercise, the oxygen concentration in the blood increases to twice that of resting levels. t or f

Victoria enjoys laughing with her friends as they walk around the track after school which best describes her heart rate during this activity

What nutrients prevent osteoporosis? a. all vitamins and minerals b. calcium, vitamins c, d, and k, and magnesium c. protein d. carbohydrates