Showing change in the composition of a population's gene pool demonstrates that evolution has occurred. a. true b. false

explanation:

they can be good for the ecosystem

c should be the answer

i believe the answer is snake.

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