Species that have maximum influence on the ecosystem are called

Options

A. Sympatric species
B. Keystone species
C. Sibling species
D. Predator species

Answer

To solve the question "Species that have maximum influence on the ecosystem are called," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for a specific term that describes species with a significant impact on their ecosystem.

2. **Analyze the Options**:
- **Sympatric Species**: This term refers to species that evolve from a common ancestor while inhabiting the same geographical area. This does not relate to their influence on the ecosystem.
- **Keystone Species**: This term describes species that have a disproportionately large effect on their environment relative to their abundance. The removal of a keystone species can lead to significant changes in the ecosystem, affecting many other species and overall biodiversity.
- **Sibling Species**: These are species that are closely related and nearly identical in appearance but do not interbreed. This term does not indicate ecological influence.
- **Predator Species**: While predators do play a role in ecosystems, the term is too broad and does not specifically denote species that have maximum influence across various ecosystems.

3. **Identify the Correct Answer**: Based on the analysis, the term that best fits the description of species with maximum influence on the ecosystem is "keystone species."

4. **Conclusion**: Therefore, the correct answer to the question is **keystone species**.