Classify the following as pure substances or mixtures. Separate the pure substances into elements, compounds and divide the mixtures into homogeneous and heterogeneous :
Milk

Explanation

To classify milk as either a pure substance or a mixture, and further categorize it, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Nature of Milk**:
- Milk is a liquid that we commonly consume. It is important to determine whether it is a pure substance or a mixture.

2. **Definition of Pure Substance**:
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