Choose the correct option:
$(1)$ On an average,a healthy human breathes ...$X$... times/minute.
$(2)$ Every $100 \, ml$ of oxygenated blood can deliver around ...$Y$... of $O_2$ to the tissues under normal physiological conditions.
$X-Y$

In high-altitude regions,the $R.B.C.$ count in humans will . . . . . . .

$I.$ $pO_2$ is the major factor which affects the binding of $CO_2$ with haemoglobin.
$II.$ $pCO_2$ is low and $pO_2$ is high in tissues.
$III.$ $RBC$ contains a very high concentration of carbonic anhydrase.
$IV.$ Every $100 \; mL$ of deoxygenated blood delivers approximately $4 \; mL$ of $CO_2$ to alveoli.
Select the combination of right statements.

Select the correct match.

Which of the following are the correct statements regarding respiration in humans?

Which physiological adaptation occurs in people living at high altitudes to survive in low atmospheric pressure?