It is important to consult with a doctor or coach before beginning an exercise regimen because he or she
a. won't steer you wrong in identifying the right amount of exercise.
b. cannot tell you if the activity you want to try is right for you.
c. won't be sure you have all three types of exercise in your routine.
d. won't check your medical records to see if any illnesses or conditions would prohibit you from the activity.

As you sit in the library with your friend studying for your weekly quiz on the integumentary system, you come upon an article about the hazards of prolonged exposure to the sun's rays. your curious nature leads you to research the subject further. you're fascinated to learn that minimal exposure to the sun allows you skin to manufacture vitamin d, which is important to maintain homeostasis. you also read that although sunscreen can protect you from the ultraviolet (uv) rays of the sun, some medications can actually increase a person's sensitivity to the sunlight.