For each module in the course summarize what you have learned in at least three sentences. For example: if you have four modules you should turn in a four-paragraph essay.

digestion

it excretes wastes

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