Answer:
The walls of the alveoli are composed of two types of cells, type I and type II alveolar cells. The function of type II alveolar cells is to <u>secrete surfactant</u>.
Explanation:
Type II cells have great importance in the synthesis, storage, and secretion of lung surfactant, which acts to reduce surface tension and prevent collapse of the alveoli, reducing the pulmonary tension, it helps the respiratory mechanics, minimizing the energy that the lung tissue must provide to keep the gas exchange surface open and exposed during successive inspiration-expiration cycles. Type II cells comprise up to 14% of all alveolar epithelial cells.
It’s going to be Hydrogen bonding
The answer is " heat and pressure deep in the earth is causing old rock to melt back into magma"
i hope this helps
think its the second one,have a nice day