Name two group of animals that respire via gils ?

Explanation

To answer the question "Name two groups of animals that respire via gills," we can follow these steps:

### Step-by-Step Solution:

1. **Understand what gills are**:
- Gills are specialized respiratory organs found in aquatic organisms. They are responsible for the exchange of gases, allowing these animals to extract oxygen from water.

2. **Identify the groups of animals that use gills**:
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