The respiratory system expels carbon dioxide
The meaning of Biomechanical Principles refer to the study of mechanical principles of living organisms. (Usually their movement and structure)
Relating these principles to hiking, make it apparent that hiking includes physical movement, such as walking and minor climbing. We can use these principles in the way an organism moves while hiking, such as their body structure while walking, or the movement of how they climb.
Answer: The answer should be A & B
Explanation:
The reason the answer is A and B is because teenagers are recommended to have approximately 1 hour of exercise per day. A teenager needs to have moderate or even vigorous exercise to meet their daily needs. The answers C&D both will equal 1 hour and are both moderate to vigorous exercise.
