Why is 3-D printing considered additive manufacturing? * It manufactures small objects.
It builds objects out of plastic.
It is a new way to manufacture objects.
It creates objects by adding layers.

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explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."