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Assertion : In mammals, complex respirat...

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

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b
mammalian skin in impermeable so that water loss thorugh it is minimized. But mammals need far more oxygen to maintain their high metabolic rates than lower animal , so they need a more extensive repiratory surface. Thus a complex respiratory system has evolved in mammals to meet this need. the mammalina repiratory system consists of the nasal cavity , nasopharynx , larynx , tachea, bronchi , bronchiole and lungs.
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