Answer:
Step-by-step explanation:
The equation that models the equilibrium between hemoglobin, oxygen, and oxyhemoglobin is:
![Hb(aq)+O_2(g)\rightleftharpoons HbO_2(aq)](https://img.qammunity.org/2021/formulas/chemistry/middle-school/vp6ut0888o1iufkm7jw15f7glyz7sc13pi.png)
According to LeChatelier's principle, the equilibrium shifts to counteract the the unbalancing action.
As the climbers ascend, the concentration of oxygen, O₂(g) decreases, meaning that the reverse reaction will increase, allowing the oxyhemoglobin produce more oxygen. Thus, the equilbrium would shift to the left as the climbers ascend to higher altitudes.