What means consisting of parts that are not the same?

The term used to describe something that consists of parts that are not the same is "heterogeneous." In a heterogeneous mixture, the different components can often be distinguished from one another and may have varying properties. This contrasts with a homogeneous mixture, where the components are uniformly distributed and indistinguishable. Examples of heterogeneous substances include salad, sand and gravel, or a mixture of oil and water.