What is the mechanism of respiration seen in aquatic animals?

Explanation

### Step-by-Step Solution:

1. **Definition of Aquatic Animals**: Aquatic animals are those that live in water. They include various species such as fish, amphibians, and some invertebrates.

2. **Respiratory Organs**: The primary organs used for respiration in aquatic animals, particularly in fish, are called gills. Gills are specialized structures that facilitate the exchange of gases.

3. **Water Intake**: Aquatic animals take in water through their mouths. This is the first step in the respiration process.

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