Which of the following is not a physical factor that affects ventilation?

A.
size of the alveoli

B.
thoracic wall compliance

C.
size of the airway

D.
contraction and relaxation of muscle fibers

what subject is this

burning fossil fouls really decrease the carbon in the atmosphere so b

all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

hope it ,

bioteacher101