A tossed salad is considered a heterogeneous mixture. This means that the different components of the salad, such as lettuce, tomatoes, cucumbers, and dressing, are not uniformly distributed throughout the mixture. You can easily distinguish and separate these individual ingredients when looking at a salad.
In a homogeneous mixture, the composition is consistent and uniform throughout, like sugar dissolved in water. However, in a tossed salad, the various components retain their individual properties and can be seen and picked out. This characteristic makes salads a clear example of a heterogeneous mixture.