Which of the following is an example for commensalism?

Options

A. Cattle egret and grazing cattle
B. Sea anemone and clown fish
C. Barnacles and whales
D. All

Answer

To determine which of the given options is an example of commensalism, we need to understand the definition of commensalism and analyze each option.

### Step-by-Step Solution:

1. **Understand Commensalism**: Commensalism is a type of symbiotic relationship where one organism benefits while the other is neither helped nor harmed.

2. **Analyze the Options**:
- **Option A: Cattle and Great Egret**: In this relationship, the great egret benefits by eating insects that are disturbed by the grazing cattle. This is an example of mutualism, not commensalism, because both species benefit.

- **Option B: Sea Anemone and Clownfish**: This is another mutualistic relationship. The clownfish gets protection from predators by living among the sea anemone's stinging tentacles, while the anemone benefits from the clownfish's presence, which can help attract food.

- **Option C: Barnacles and Whales**: In this case, barnacles attach themselves to the skin of whales. The barnacles benefit by having a stable place to live and access to food as the whale swims through water. The whale, however, is not significantly affected by the presence of barnacles, making this an example of commensalism.

- **Option D: All**: Since not all the options represent commensalism, this option is incorrect.

3. **Conclusion**: The correct answer is **Option C: Barnacles and Whales**, as this relationship exemplifies commensalism.

### Final Answer:
The example of commensalism is **Option C: Barnacles and Whales**.

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