………..is defined as an ecological state of a species being unique to a specific geographic location.

Options

A. Exotic species
B. Endemic species
C. Ecosystem
D. Endangered species

Answer

To solve the question, we need to identify the term that describes a species being unique to a specific geographic location. Let's break down the options provided:

1. **Exotic Species**: These are species that are introduced to an area outside their natural geographic range. They are not unique to a specific location but rather are found in multiple areas after being introduced.

2. **Endemic Species**: This term refers to species that are found exclusively in a particular geographic area and nowhere else in the world. This matches the definition given in the question.

3. **Ecosystem**: An ecosystem is a broader term that describes a community of living organisms and their physical environment interacting as a system. It does not specifically refer to the uniqueness of a species.

4. **Endangered Species**: This term refers to species that are at risk of extinction. While they may be unique to a location, the term does not specifically denote uniqueness to a geographic area.

Based on the definitions, the correct answer is **Endemic Species**.

### Step-by-Step Solution:
1. **Identify the Question**: The question asks for a term that defines a species being unique to a specific geographic location.

2. **Analyze the Options**: Review each option to see which one fits the definition provided.
- Exotic Species: Not unique, introduced to new areas.
- Endemic Species: Unique to a specific geographic area.
- Ecosystem: Refers to a community of organisms, not specific to a species.
- Endangered Species: At risk of extinction, not necessarily unique.

3. **Select the Correct Answer**: The option that fits the definition is **Endemic Species**.

4. **Conclusion**: Endemic species are those that are found only in a particular region and nowhere else, confirming that the answer is correct.