Answer:
A. Physical Fatigue
Explanation:
Physical pretty much means pertaining to the body. Muscles are a system in the human body, therefore physical. Also think about breaking down the word physical activity. What are you using during exercise? Your MUSCLES :)
the answer is myelo
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lungs
you have a right and a left lung, only 1 diaphragm, only one trachea, and alveoli are part of the lung
