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 will analyze the options provided and identify the correct term.

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the type of species that has the most significant impact on the ecosystem. This means we are looking for a species that plays a critical role in maintaining the structure and stability of the ecosystem.

2. **Evaluate the Options**:
- **Sympatric Species**: These are species that have evolved from a common ancestor and live in the same geographic area. While they may interact, they do not necessarily have a major influence on the ecosystem as a whole.
- **Keystone Species**: These species have a disproportionately large effect on their environment relative to their abundance. They are crucial for maintaining the structure of an ecological community. If a keystone species is removed, it can lead to significant changes in the ecosystem, often resulting in the collapse of the community.
- **Sibling Species**: These are species that are very similar in appearance but do not interbreed. They do not have a significant impact on the ecosystem.
- **Predator Species**: While predators play an important role in food chains and ecosystems, they do not necessarily have the broad influence that keystone species do.

3. **Identify the Correct Answer**: Among the options, the term that best describes species with maximum influence on the ecosystem is **Keystone Species**. These species are essential for the stability and health of their ecosystems.

### Final Answer:
Species that have maximum influence on the ecosystem are called **Keystone Species**.

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