Cardiorespiratory fitness improves the efficiency of the cardiovascular and the respiratory systems in delivering oxygen to the body. t f

That statement is true

During cardiovascular exercise, our body lose a huge amount of energy, so our body demand more oxygen intake as a source to burn more calories.

With the increase of oxygen demand, our heart will beat faster so it can transfer more oxygen throughout our body. By doing cardiovascular exercise regularly, we condition our body to be efficient in delivering the oxygen 

Dialect is probably part of the answer

D) better spellers i would think