Animals living in colder region have shorter tail and ears as compared to the animals living in warmer regions. This phenomenon is called

Options

A. Allen's law
B. Cope's law
C. Bergmann's law
D. Dollo's law

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question states that animals living in colder regions have shorter tails and ears compared to those in warmer regions. We need to identify the phenomenon that describes this observation.

2. **Identifying the Options**: The options provided are:
- A) Elin's law
- B) Cope's law
- C) Bergman's law
- D) Doro law

3. **Analyzing the Options**:
- **Elin's Law**: This law states that animals in colder climates tend to have shorter extremities (like tails and ears) to minimize heat loss.
- **Cope's Law**: This law relates to the trend of increasing body size over evolutionary time.
- **Bergman's Law**: This law states that within a species, individuals in colder climates tend to be larger than those in warmer climates.
- **Doro Law**: This is not a widely recognized law in the context of animal adaptation.

4. **Applying the Knowledge**: Since the question specifically mentions shorter tails and ears in colder climates, we can conclude that this is a direct application of Elin's Law.

5. **Conclusion**: Therefore, the phenomenon described in the question is called **Elin's Law**.

**Final Answer**: The correct option is A) Elin's law.

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