Tell the basic unit of classification.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Classification**: Classification in biology is the process of organizing living organisms into categories based on shared characteristics.

2. **Taxonomic Hierarchy**: The classification system is structured in a hierarchical manner, consisting of different levels or categories.

3. **Categories of Classification**: There are eight major taxonomic categories in the hierarchy:
- Domain (highest category)
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