a scientist wants to display how the number of frogs in a pond gradually
declined over a 10-year period. what sort of visual display should the
scientist use?

b

explanation:

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

answerhomologous structures;