Along-distance runner wants to achieve his personal best time at the next cross country meet. what type of activity would be the most appropriate to focus on during training to accomplish this goal?
aerobic activities
muscle-strengthening activities
bone-strengthening activities
balance and stretching activities

Which of the following statements concerning cancer and mutations is correct? a: cancer can only occur with a mutation in a somatic cell. b: usually, multiple mutations are required in different genes to cause cancer. c: none of the other answer options is correct. d: cancer can only occur with a mutation in a germ cell. e: usually, a single mutation is all that is required to cause cancer.