Write the suitable terms corresponding to the description given below.
The nature of a substance where the distribution of the different kinds of molecules is not uniform

Explanation

**Step-by-Step Solution:**

1. **Understanding the Description**: The question asks for a term that describes a substance where the distribution of different kinds of molecules is not uniform. This means that in this substance, you can see distinct parts or components.

2. **Identifying the Type of Mixture**: In chemistry, substances can be classified as either homogeneous or heterogeneous. A homogeneous mixture has a uniform distribution of components, while a heterogeneous mixture has a non-uniform distribution.

3. **Defining Heterogeneous Mixture**: A heterogeneous mixture is defined as a mixture that does not have a consistent composition throughout. In such mixtures, the different components can often be seen and separated from one another.

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