Question

how efficiency of the gas exchange can be increase?

Answer 1

by increasing the surface of the interface between the compartments, this is reason for the structure of the lung.

Answer 2

but it also have connection with fick's law but i cannot understand about it

Answer 3

in fick's law you want to consider concentration gradient that is related to the movement of particles.Increasing the temperature will increase the particles movement and hence gas exchange. That's one of the reasons to breath through the nose (i.e. to warm the air).