Question

question 14: what could be a possible source of error in this experiment? (1 point) using the same exercise for all participants measuring heart rates at different times after exercise recording both breathing and heart rate data having more than one volunteer question 15: if students wanted to study the muscular system instead, which change should they make? (1 point) measure muscle strength before and after exercise measure breathing rate during rest only measure body temperature after exercise record the number of breaths per minute during rest only

Explanation:

For Question 14, measuring heart - rates at different times after exercise can introduce variability and be a source of error as the heart - rate recovery time can skew results. For Question 15, to study the muscular system, measuring muscle strength before and after exercise directly assesses the muscular system's response to exercise.

Answer:

Question 14: Measuring heart rates at different times after exercise
Question 15: Measure muscle strength before and after exercise