The answer is B :) demonstrate mild detox symptoms
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Blood exchanges carbon dioxide for oxygen in the C.) Alveoli.
Answer: 1. increase resistance for a particular exercise when you can complete 3 sets of an exercise.
Answer: A) Heart and lungs
Explanation:
The heart becomes more efficient with every beat as it pumps oxygen-carrying blood, the lungs more effective in taking in oxygen, and the muscles more equipped to use more oxygen.