Distinguish between the conditions needed for the proper functioning of pepsin and trypsin.

c.           is the correct answer

i think its both a and 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