The respiratory system, and the cardio vascular systems.
Answer:
Claim 3 is the strongest
Explanation:
Claim 3 is the strongest because athletes prefer to enhance their performance by practicing in regions of high altitude as this enhances their performances by 1 to 2 percent. The reason behind their claim is that at higher altitudes less oxygen is drawn per breath as compared to the oxygen drawn per breath in lower altitudes.
Answer is in the photo. I can't attach it here, but I uploaded it to a file hosting. link below! Good Luck!
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Brain or scrotum it’s a endorphin
