Question

the air sacs that are covered with capillaries where gas exchange takes place lungs oxygen alveoli bronchi

Explanation:

Alveoli are tiny air - sacs in the lungs. They are surrounded by a network of capillaries. This structure allows for efficient gas exchange. Oxygen from the inhaled air diffuses across the alveolar and capillary walls into the blood, while carbon dioxide diffuses from the blood into the alveoli to be exhaled. Lungs are the major organs of the respiratory system but are not the specific air - sacs. Oxygen is a gas involved in the gas exchange process, not the air - sac itself. Bronchi are the main passageways into the lungs and not the site of gas exchange.

Answer:

C. alveoli