Final answer:
Heterogeneous mixtures are not uniform throughout, while homogeneous mixtures are uniform throughout.
Step-by-step explanation:
Heterogeneous mixtures, as the name implies, are mixtures that are not uniform throughout. The composition of a heterogeneous mixture can vary from one part of the mixture to another. For example, a mixture of oil and water is heterogeneous because the oil and water do not mix evenly throughout the solution.
In contrast, homogeneous mixtures have a uniform composition throughout. The particles in a homogeneous mixture are evenly distributed and cannot be easily separated. An example of a homogeneous mixture is a solution of salt dissolved in water.