Unit of evolution is

Options

A. Population
B. Species
C. Individual
D. Subspecies

Answer

### Step-by-Step Solution:

1. **Understanding the Concept of Evolution**:
- Evolution refers to the change in the heritable characteristics of biological populations over successive generations. It is driven by processes such as natural selection, mutation, gene flow, and genetic drift.

2. **Identifying the Units of Evolution**:
- In biological terms, the unit of evolution can refer to different levels of organization, such as individuals, populations, species, and subspecies.

3. **Analyzing the Options**:
- **Option A: Population**: A group of individuals of the same species that live in a specific area and interbreed. They are the smallest unit that can evolve as they share a common gene pool.
- **Option B: Species**: A group of organisms that can interbreed and produce fertile offspring. While species can evolve, they are broader than populations.
- **Option C: Individual**: Refers to a single organism. Evolution does not occur at the individual level but rather at the population level.
- **Option D: Subspecies**: A taxonomic category that ranks below species. While subspecies can evolve, they are not the primary unit of evolution.

4. **Conclusion**:
- The correct answer is **Option A: Population**. Populations are the smallest units that can undergo evolutionary changes through mechanisms such as natural selection and genetic drift.