A child lives who lives down the street from you knows you are taking a class on physical fitness and has asked you for some advice. He is only 11 years old now, but he wants to plan for a healthy future. His question to you is whether he should worry about his bone strength now or when he is in his 40s or 50s. What should you tell him?

How do the uv rays cause damage?   what exactly causes the skin to burn;   can you be more specific about this mechanism?   3. how do photosensitive medications increase a person's sensitivity to sunlight and therefore increase their risk of getting burned?     what kind of medications can increase photo-sensitivity, can you think of some examples?

Energy needs, in total kilocalories per day, are greater during than any other time of life. a.childhood b.infancy c.adulthood d.adolescence

What ingredients used in tobacco products been banned?