The basic unit of classification is

Options

A. species
B. genus
C. family
D. phylum

Answer

**Step-by-Step Solution:**

1. **Understanding Taxonomic Hierarchy**: Classification of organisms is organized in a hierarchical structure known as taxonomic hierarchy. This hierarchy includes several levels: species, genus, family, order, class, phylum, and kingdom.

2. **Identifying the Basic Unit**: Among these levels, the most fundamental unit of classification is the species. A species is defined as a group of organisms that can interbreed and produce fertile offspring, sharing common characteristics.

3. **Hierarchy Breakdown**:
- **Species**: The smallest unit, representing individual organisms that are similar.
- **Genus**: A group of closely related species.
- **Family**: A group of related genera.
- **Order**: A group of related families.
- **Class**: A group of related orders.
- **Phylum**: A group of related classes.
- **Kingdom**: The highest taxonomic rank, grouping together all forms of life.

4. **Conclusion**: Based on the taxonomic hierarchy, the basic unit of classification is the species.

**Final Answer**: The basic unit of classification is the species.

---