Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?

Explanation

### Step-by-Step Solution

1. **Understanding Warm-Blooded Animals**:
- Mammals and birds are classified as warm-blooded (endothermic) animals. This means they can regulate their body temperature internally, regardless of the external environment.

2. **Importance of Temperature Regulation**:
- Warm-blooded animals maintain a constant body temperature by adjusting their metabolic processes. This ability allows them to thrive in various environmental conditions.

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