In matter, the term heterogeneous is described as mixtures with visibly different parts.

• A. Uniform mixtures
• B. Pure elements
• C. Substances with uniform composition
• D. Mixtures with visibly different parts

Answer: (D)

Heterogeneous mixtures are those where the different parts are not spread evenly, so you can see distinct components. The phrase “mixtures with visibly different parts” matches that idea, since you can identify the separate substances in the mix.

The other descriptions describe different ideas. A uniform mixture is spread evenly throughout, which is characteristic of homogeneous mixtures, not heterogeneous ones. Pure elements are single substances, not mixtures at all. Substances with uniform composition describe homogeneous materials (like pure water or air), not mixtures with visible parts.