Which group of animals have well-developed respriatory system ?

Explanation

### Step-by-Step Text Solution:

1. **Understanding Respiratory Systems**: Different groups of animals possess varying complexities in their respiratory systems. A well-developed respiratory system is essential for efficient gas exchange.

2. **Identifying Groups**: The major groups of animals that have well-developed respiratory systems include:
- **Chordates**: This phylum includes a diverse range of animals, many of which have specialized respiratory organs.

3. **Examples of Chordates**:
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