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Answer:
we walk against gravity as we climb uphill hence our body requires more energy and energy in our body is supplied by breaking down of oxygen molecules hence, to supply more oxygen to our body our breathing rate increases
hope it helps....
Verified answer
•Because amount of oxygen decreases and pressure gradually increases.•The rate of breathing increases while climbing uphill because the atmosphere is very thin at high altitudes and hence the amount of oxygen present in the air deceases.