Carbohydrates and fats both can be used as an energy source by organisms
can be bonded together to construct DNA molecules
are made up of the glucose monomer
are monomers that can be made into large polymer chains

can be used as an energy source by organisms.

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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

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