Answer:
<em>Pulmonary surfactant.</em>
Explanation:
It is essential for life as it lines the alveoli to lower surface tension, thereby preventing atelectasis (a complete or partial collapse of the entire lung or area (lobe) of the lung) during breathing.
Answer:4
i just remember
Cartilage damage
Hope this helps!
If not, I am sorry.
Answer: the third
e I think. Let me know if I got it wrong!