Extinction of Stellar's sea cow is due to which of the following reasons :-

Options

A. Habitat loss
B. Over exploitation
C. Alien species invasion
D. Co-extinction

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the reasons behind the extinction of Stellar's sea cow. To answer this, we need to analyze the provided options: habitat loss, over-exploitation, alien species invasion, and coexistence.

2. **Evaluating Habitat Loss**: Habitat loss refers to the destruction or alteration of the natural environment where an organism lives. While habitat loss is a significant factor for many species, it is not the primary reason for the extinction of Stellar's sea cow. The natural habitat of Stellar's sea cow was not significantly reduced in a way that led to its extinction.

3. **Considering Over-Exploitation**: Over-exploitation involves excessive hunting or harvesting of a species beyond sustainable levels. Stellar's sea cow was heavily hunted for its meat and fat by humans, leading to its rapid decline and eventual extinction. This is widely recognized as the primary cause of its extinction.

4. **Analyzing Alien Species Invasion**: Alien species invasion occurs when non-native species are introduced to an ecosystem, often leading to competition with native species. While this can cause extinction in some cases, it was not a factor in the extinction of Stellar's sea cow.

5. **Examining Coexistence**: Coexistence refers to the ability of different species to live together in the same environment. The extinction of Stellar's sea cow was not due to issues of coexistence with other species, as it was primarily impacted by human activities.

6. **Conclusion**: After evaluating all the options, the correct answer is that the extinction of Stellar's sea cow was primarily due to over-exploitation by humans.

**Final Answer**: The extinction of Stellar's sea cow is due to over-exploitation.

---