Olympic athletes have lower resting heart rates because
a. their lungs tend to be naturally larger.
b. they exercise regularly, which improves the efficiency of their heart.
c. they have a lot of muscle mass due to weightlifting.
d. they tend to eat low-fat diets.

What fraction of high school seniors in the united states admit to drinking alcohol

Select all that apply. which of the following are functions of the skeletal system? 1. to provide the body with a strong and mobile framework 2. to allow the body to move 3. to protect internal organs from sunlight, bacteria, and injury 4. to supply the body with blood cells and minerals

Why girls are tan and why they fake tan