How many categories are there in hierarchy classification?

Explanation

### Step-by-Step Solution:

1. **Understanding Hierarchical Classification**: Hierarchical classification is a system used in biology to categorize and organize living organisms based on their similarities and differences. It involves several levels or ranks.

2. **Identifying the Number of Categories**: In the hierarchical classification system, there are a total of **seven categories** or ranks. These categories help in classifying organisms systematically.

3. **Listing the Seven Categories**:
- **Kingdom**: The highest taxonomic rank, which groups organisms based on fundamental similarities.
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