Group of organisms that closely resemble each other and freely interbreed in nature, constitute a:-

Options

A. Species
B. Genus
C. Family
D. Taxon

Answer

To solve the question, "Group of organisms that closely resemble each other and freely interbreed in nature, constitute a:", we need to analyze the definitions of the terms provided in the options.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a group of organisms that closely resemble each other and can interbreed freely in nature. This implies that the organisms share common characteristics and can reproduce to create fertile offspring.

2. **Identifying Key Terms**:
- **Closely Resemble**: This suggests that the organisms have similar physical traits or phenotypes.
- **Freely Interbreed**: This indicates that these organisms can mate and produce viable offspring.

3. **Evaluating Options**:
- **Species**: A species is defined as a group of organisms that can interbreed and produce fertile offspring. They share common ancestry and phenotypic traits. This fits the description given in the question.
- **Genus**: A genus is a taxonomic rank that groups together species that are closely related. However, it does not necessarily imply that all members can interbreed, as it can include multiple species.
- **Family**: A family is a higher taxonomic rank that includes multiple genera. Members of a family may share some morphological features but are not necessarily capable of interbreeding.
- **Taxon**: A taxon is a general term for any group of organisms at any level of classification (species, genus, family, etc.). It does not specifically refer to interbreeding capabilities.

4. **Conclusion**: Given that the definition of a species aligns perfectly with the criteria of closely resembling each other and being able to interbreed freely, the correct answer is **Species**.

### Final Answer:
The group of organisms that closely resemble each other and freely interbreed in nature constitutes a **Species**.