The number of $RBCs$ in man increases if he lives at a higher altitude; this is because

At sea level,the blood of individuals contains approximately $5$ million red blood cells per cubic millimeter. However,individuals living at an altitude of $5400$ meters have $8$ million red blood cells per cubic millimeter. Why does this increase occur?

Read the steps of respiration and arrange them in the correct sequence.
$I$ - Transport of gases by blood.
$II$ - Utilization of $O_2$ by cells for catabolic reactions and release of $CO_2$.
$III$ - Diffusion of gases across the alveolar membrane.
$IV$ - Diffusion of $O_2$ and $CO_2$ between blood and tissues.

Describe the steps of respiration in short.

Select the $INCORRECT$ match.

Respiration is the physiological process in which