What is the approximate amount of $CO_2$ eliminated by our lungs per day?

Match Column-$I$ and Column-$II$ with respect to processes involved in respiration with their explanation:

Column-$I$	Column-$II$
$i$. Cellular respiration	$a$. Exchange of gases $O_2$ and $CO_2$ between blood and tissue cells.
$ii$. Breathing	$b$. Physical process of gaseous exchange between atmospheric air and lungs.
$iii$. Internal respiration	$c$. Gaseous exchange between alveolar air and blood capillaries.
$iv$. External respiration	$d$. Food is oxidized and $ATP$ is generated.

After fast running,a man has a fast heartbeat,a slow pulse,and shallow breathing. In such conditions,he has:

Which two of the following changes $((i)$ to $(iv))$ usually occur in plain dwellers when they move to high altitudes ($3500 \ m$ or more)?
$(i)$ Increase in red blood cell size
$(ii)$ Increase in red blood cell production
$(iii)$ Increased breathing rate
$(iv)$ Increase in thrombocyte count

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.

The maximum amount of water vapour that the atmosphere can hold at a given temperature is known as: