A sucker fish (Remora) on a shark would exemplify:

Options

A. predation
B. symbiosis
C. parasitism
D. commensalism

Answer

To solve the question regarding the interaction between a sucker fish (Remora) and a shark, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organisms Involved**:
- The two organisms in question are the sucker fish (Remora) and the shark.

2. **Understand the Relationship**:
- The Remora fish attaches itself to the shark using a modified dorsal fin that acts as a sucker.

3. **Analyze the Benefits**:
- The Remora benefits from this relationship by gaining:
- **Nutrition**: It consumes small bits of food that the shark dislodges while swimming.
- **Protection**: It is shielded from predators by being attached to the larger shark.

4. **Assess the Impact on the Shark**:
- The shark is neither harmed nor significantly benefited by the presence of the Remora. The presence of the Remora does not affect the shark's health or behavior.

5. **Classify the Type of Interaction**:
- Based on the analysis, the interaction can be classified as:
- **Commensalism**: This is a type of symbiotic relationship where one organism benefits while the other is neither helped nor harmed.

6. **Eliminate Other Options**:
- **Predation**: Involves one organism benefiting at the expense of another (not applicable here).
- **Symbiotic Relationship**: Generally implies mutual benefit (not applicable here).
- **Parasitism**: Involves one organism benefiting at the expense of another (not applicable here).

7. **Conclusion**:
- The correct answer to the question is that the relationship exemplified by the sucker fish on a shark is **commensalism**.

### Final Answer:
The interaction between a sucker fish (Remora) and a shark exemplifies **commensalism**.