A group of similar organisms, which freely breeds among themselves is .........

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the term that describes a group of similar organisms that can freely breed among themselves.

2. **Defining Key Terms**:
- **Similar Organisms**: This refers to organisms that share common characteristics and traits.
- **Freely Breeds Among Themselves**: This indicates that the organisms can mate and produce offspring without barriers.

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