Which one has real existence?

Options

A. Phylum
B. Class
C. Genus
D. Species

Answer

To determine which of the given options has "real existence," we need to analyze each term in the context of biological classification.

### Step-by-Step Solution:

1. **Understanding Biological Classification**: Biological classification is a hierarchical system used to categorize living organisms. It includes several ranks such as domain, kingdom, phylum, class, order, family, genus, and species.

2. **Defining Each Option**:
- **Phylum**: A taxonomic rank that groups together organisms based on certain fundamental similarities. It is a higher-level classification.
- **Class**: A rank below phylum and above order. It groups organisms that share common characteristics.
- **Genus**: A rank below family and above species. It includes species that are closely related and share a common ancestor.
- **Species**: The most specific rank in the classification system. It refers to a group of individuals that can interbreed and produce fertile offspring.

3. **Analyzing Real Existence**:
- **Phylum, Class, and Genus** are broader categories that represent groups of organisms. They are more abstract and can include many species.
- **Species**, on the other hand, represents a specific group of organisms that can reproduce and maintain their characteristics. It is often considered the basic unit of biological classification.

4. **Conclusion**: Among the options provided, **Species** has the most "real existence" because it refers to actual populations of organisms that exist in nature and can reproduce.

### Final Answer: Species

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