The interaction in which both species are benefitted is termed.

Options

A. Commensalism
B. Mutualism
C. Amensalism
D. Parasitism

Answer

**Step-by-Step Solution:**

1. **Understanding Species Interaction**: The question asks about a type of interaction between two species where both benefit. In ecology, interactions between species can be classified into various types based on the effects they have on each other.

2. **Identifying the Correct Term**: The interaction where both species benefit is known as "mutualism." In mutualism, both species involved gain advantages that enhance their survival and reproduction.

3. **Examples of Mutualism**: A classic example of mutualism is the relationship between lichens, which consist of a fungal partner and an algal partner. The algal partner performs photosynthesis, providing food for the fungal partner, while the fungal partner offers shelter and moisture to the algal partner.

4. **Differentiating from Other Interactions**: It is important to differentiate mutualism from other types of interactions:
- **Commensalism**: One species benefits while the other is neither helped nor harmed (e.g., barnacles on a whale).
- **Amensalism**: One species is harmed while the other is unaffected (e.g., a tree shading out smaller plants).
- **Parasitism**: One species benefits at the expense of the other (e.g., a parasite living in a host).

5. **Conclusion**: Therefore, the interaction in which both species benefit is termed "mutualism."

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