Final answer:
Mixtures are combinations of pure substances, with pizza being a heterogeneous mixture, while drinking water, air, and brass are substances or homogeneous mixtures.
Explanation:
Mixtures are combinations of two or more pure substances in variable proportions where individual substances retain their identities. Pizza is a heterogeneous mixture as its components like cheese, tomato, mushrooms, and peppers are not evenly distributed. However, drinking water, air, and brass can be classified as substances or homogeneous mixtures.
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