Which of the following statements is correct?

Which of the following is functional for protection against the environmental abiotic factor of temperature or for thermoregulation of the living body during winter or summer?

When the external temperature is higher than our body temperature, we regulate it by $........$, and when it is lower than our body temperature, we regulate it by $........$.

What are the functions of hemoglobin and chlorophyll?

$I.$ $pO_2$ 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.

Match the following:

Column-$I$	Column-$II$
$1$. $97\%$ of $O_2$ is transported	$p$. Bicarbonate
$2$. $70\%$ of $CO_2$ is transported	$q$. $RBC$
$3$. $100$ $ml$ of oxygenated blood	$r$. $4$ $ml$
$4$. $100$ $ml$ of deoxygenated blood	$s$. $5$ $ml$