Answer:
The efficiency of the cardiovascular system
Explanation:
Cardiovascular endurance is how efficiently your heart, blood vessels, and lungs to supply oxygen rich blood to working muscles during physical activity (aerobic activity like walking, running, cycling or playing a sport) for a prolonged period of time or for more than 90 seconds.
C.) Air pressure.
Air pressure has nothing to do with breathing really. Air pressure is the pressure brought by the weight of air in the atmosphere of Earth.
The answer is : Preparing a presentation for an important executive
