When Amy carriers a heavy book bag all the way to school, she is demonstrating 1. hypertrophy
2.Muscular endurance
3.muscular strength

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Which of the following mental illness does not begin during adolescence? a. post-traumatic stress disorder b. obsessive-compulsive disorder. c. schizophrenia. d. addictions

Explain why many people are concerned about uv rays? explain what causes the skin to burn in the sun? explain why people should avoid the sun if taking a photosensitive medication?