Which is the smallest classification group?

Explanation

To determine the smallest classification group in biological classification, we can follow these steps:

1. **Understand Biological Classification**: Biological classification is a system used to categorize living organisms into groups based on shared characteristics.

2. **Identify the Hierarchical Levels**: The classification system is organized into several hierarchical levels, starting from the broadest to the most specific. The main levels are:
- Domain
- Kingdom
- Phylum
...