On high mountains, difficulty in breathing is due to___________
A. Decrease in partial pressure of O,
B. Decrease in amount of O,
C. Increase in CO, concentration
D. All of the above
Answer:A
On high mountains, difficulty in breathing is due to___________
A. Decrease in partial pressure of O, B. Decrease in amount of O, C. Increase in CO, concentration D. All of the above