Tomato juice is classified as a heterogeneous mixture. This classification stems from the fact that when you observe tomato juice, you may see bits of pulp or seeds suspended in the liquid. These components do not blend uniformly, meaning that if you were to take samples from different parts of the juice, the concentration of solids might vary.
In a homogeneous mixture, the components are evenly distributed, and you cannot distinguish one part from another. While tomato juice appears mostly uniform when stirred, the presence of solids means it does not truly achieve this level of uniformity throughout its entirety.
Therefore, because tomato juice contains various components that remain distinct and do not fully integrate into a single phase, it is not a pure substance (which consists of only one type of entity) or a homogeneous mixture. Instead, it fits the definition of a heterogeneous mixture due to the physical variation within the juice itself.