The species confined to a particular region and not found elsewhere is termed as

Options

A. Keystone
B. Alien
C. Endemic
D. Rare

Answer

To answer the question "The species confined to a particular region and not found elsewhere is termed as," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking for a specific term that describes species that are unique to a particular geographic area and do not exist in any other location.

2. **Consider the Options**: The options provided are:
- Keystone species
- Alien species
- Endemic species
- Rare species

3. **Define Each Term**:
- **Keystone Species**: A species that has a disproportionately large effect on its environment relative to its abundance. Its removal can lead to significant changes in the ecosystem.
- **Alien Species**: Also known as non-native or invasive species, these are species that are introduced to an area where they do not naturally occur. They can disrupt local ecosystems.
- **Endemic Species**: These are species that are native to a specific region and are not found anywhere else in the world.
- **Rare Species**: These are species that are not commonly found and may be at risk of extinction, but they are not necessarily confined to a specific region.

4. **Identify the Correct Answer**: Among the options, the term that accurately describes species confined to a particular region and not found elsewhere is **endemic species**.

5. **Conclusion**: Therefore, the correct answer to the question is **endemic species**.