Final answer:
Saline is a homogeneous mixture as it has a uniform composition throughout. Examples of other homogeneous mixtures include air and gasoline.
Step-by-step explanation:
The answer to the student's question about a homogeneous mixture is saline (a solution of salt in water). By definition, a homogeneous mixture, or solution, has a uniform composition and appearance throughout. For instance, a half-empty bottle of saline will have the same concentration and properties as a full one, provided it's been mixed adequately.
Examples of homogeneous mixtures include air, gasoline, and various solutions like sugar in water or a sports drink. Homogeneous mixtures are essential in various science and industry applications due to their consistent properties.