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Mammals living in cold climate have smal...

Mammals living in cold climate have small ears and legs. Which rule do they fulfill?

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**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks about the adaptation of mammals living in cold climates, specifically regarding their small ears and legs. 2. **Identifying the Adaptation**: Mammals in cold climates tend to have smaller extremities (ears and legs). This is an adaptation to conserve heat. 3. **Relating to Biological Principles**: The principle that explains this adaptation is known as Allen's Rule. Allen's Rule states that endothermic (warm-blooded) animals in colder climates tend to have shorter limbs and body parts compared to those in warmer climates. This helps reduce heat loss. ...
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