Allen's rule state that

Options

A. Mammals from colder climates have larger body size to minimize heat loss
B. Fishes growing in polar region have large number of vertebrae to maximize heat loss
C. Mammals from colder climates generally have extremities to minimize heat loss
D. Birds found in colder geographical zone have broader wings to maximize surface area

Answer

**Step-by-Step Text Solution:**

1. **Understanding Allen's Rule**: Allen's rule is a principle in biology that explains how the body shapes and sizes of animals are adapted to their environments, particularly in relation to temperature.

2. **Key Concept of Allen's Rule**: The rule states that animals that live in colder climates tend to have shorter limbs and bodily appendages compared to animals that live in warmer climates. This adaptation helps to minimize heat loss.

3. **Examples of Allen's Rule**:
- Mammals in cold regions, such as polar bears, have shorter extremities (like shorter legs and ears) to reduce the surface area through which heat can escape.
- Conversely, animals in warmer climates, like those in tropical regions, have longer limbs and appendages to help dissipate heat.

4. **Analyzing the Options**:
- The first option states that mammals from colder climates have larger body sizes to minimize heat loss, which is incorrect.
- The second option mentions fishes in polar regions having a large number of vertebrae to maximize heat loss, which is also incorrect.
- The third option correctly states that mammals from colder regions generally have short extremities to minimize heat loss, which aligns with Allen's rule.
- The fourth option about birds in colder zones having broader wings to maximize surface area is incorrect as it does not relate to Allen's rule.

5. **Conclusion**: Based on the analysis, the correct statement that aligns with Allen's rule is that mammals from colder climates generally have short extremities to minimize heat loss.

**Final Answer**: Allen's rule states that animals adapted to cold climates have shorter limbs and bodily appendages than those adapted to warm climates.

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