The autumn days shorten and get colder. the leaves lose their normal green color and turn red, yellow, and brown. this color change is the first sign of as winter approaches.

atp is used for energy.

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