Given a scientific question, generate a correct answer to it.

Input: Consider Input: A mixture of a metal with one or more other elements is called?

Output: an alloy

Input: Consider Input: The number, size, shape, and banding pattern of chromosomes make them easily identifiable in a what?

Output: karyogram

Input: Consider Input: Acid rain is corrosive rain caused by rainwater falling to the ground through which gas?
Output: sulfur dioxide