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The answer for the completion exercise shown above is the first option: descreases.

 Therefore, the completed sentence is shown below: "...you climb a high mountain, the buoyant force exerted on you by the atmosphere decreases". 

 As you know, the atmosphere is a fluid and when you rise in altitude, the pressure decreases. 

Answer:

decreases

Explanation:

When a body is immersed in a fluid, it experiences an upward force, which is called buoyant force or upthrust force.

The formula for the buoyant force is given by

Buoyant force = Volume of body immersed x density of fluid x acceleration due to gravity.

As we go up from the earth surface, the value of density of air goes on decreasing and the value of acceleration due to gravity is also decreasing. So, the buoyant force is also decreasing.

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