(C) In a gill,the lamellae are the structural units responsible for gas exchange. Similarly,in a lung,the alveoli are the tiny air sacs that serve as

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(C) In a gill,the lamellae are the structural units responsible for gas exchange. Similarly,in a lung,the alveoli are the tiny air sacs that serve as the primary sites for gas exchange. Therefore,the second term represents the functional unit for oxygen absorption within the first organ.