Answer:
Reuben has a blocked vas deferens
Explanation:
Acute exposure to high altitude can affect the cardiovascular system by decreasing oxygen in the blood (acute hypoxia). It also increases demand on the heart, adrenaline release and pulmonary artery pressures.
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Aerobic exercise can lead to an increase in flexibility
Pulling a wagon uphill; the more uphill the wagon is, the greater amount of energy that will be exerted when the wagon moves downhill.
