Assertion: In mammals,a complex respiratory s | vedclass

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(A) Mammalian skin is thick and keratinized,making it impermeable to gases,which helps in preventing water loss. Because mammals have high metabolic r

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If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

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(A) Mammalian skin is thick and keratinized,making it impermeable to gases,which helps in preventing water loss. Because mammals have high metabolic rates,they require a significantly higher amount of oxygen compared to lower animals. Since cutaneous respiration (skin breathing) is insufficient to meet these high oxygen demands,mammals have evolved a complex respiratory system consisting of the nasal cavity,nasopharynx,larynx,trachea,bronchi,bronchioles,and lungs to provide a large surface area for gas exchange. Therefore,both the Assertion and the Reason are correct,and the Reason correctly explains why a complex respiratory system is necessary in mammals.

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.

Assertion: In mammals,a complex respiratory system has developed.
Reason: Mammalian skin is impermeable to gases.

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Assertion: In mammals,a complex respiratory system has developed.Reason: Mammalian skin is impermeable to gases.