Certain millipedes and Silver Fish live in nest of Army Ant feeding on their refuse. The relatioship is

Options

A. commensalism
B. mutualism
C. protocooperation
D. scavenging.

Answer

### Step-by-Step Solution:

1. **Identify the Organisms Involved**: The question mentions two types of organisms: millipedes and silverfish, which live in the nests of army ants.

2. **Understand the Nature of the Relationship**: The millipedes and silverfish are feeding on the refuse of the army ants. This indicates that they are deriving some benefit from living in the nests of the army ants.

3. **Classify the Type of Symbiotic Relationship**:
- **Commensalism**: In this relationship, one organism benefits while the other is neither helped nor harmed.
- **Mutualism**: In this relationship, both organisms benefit from the interaction.
- **Proto-cooperation**: This is a type of mutualism where both organisms benefit, but it is not essential for their survival.

4. **Determine the Correct Classification**: Since the millipedes and silverfish are benefiting from the refuse of the army ants, and the army ants are not negatively impacted by their presence, this relationship can be classified as **commensalism**. However, if we consider that the millipedes and silverfish may also provide some benefit to the army ants (like cleaning up refuse), it could also be viewed as proto-cooperation.

5. **Conclude the Answer**: The relationship between millipedes, silverfish, and army ants is primarily one of **commensalism**.