Name the highest category in taxonomic hierarchy.

Explanation

**Step-by-Step Solution:**

1. **Understanding Taxonomic Hierarchy**: The taxonomic hierarchy is a system used to classify and organize living organisms into various levels based on their similarities and differences.

2. **Levels of Taxonomic Hierarchy**: The hierarchy consists of several ranks, which are arranged from the broadest category to the most specific. The common ranks in this hierarchy are:
- Kingdom
- Phylum
- Class
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