PLEASE SOMEONE HELP THIS IS DUE IN 2
MINUTES ILL GIVE BRAINLIET

as many times as you want

trachea, alveoli, lung capillaries, arteries

which

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