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because the light is a great source of energy for the plants to survive. (i hope this )

genetic variation will increase because of a new habitat and food source.

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