Which of the following statements is correct with regard to Bergmann's rule?

Options

A. Animals of colder area have large size than of hot areas.
B. Fish of colder area have large size
C. Birds of colder areas have narrow winds
D. Animals of colder areas posses thick fur

Explanation

**Step-by-Step Solution:**

1. **Understanding Bergmann's Rule**: Bergmann's rule states that within a species or closely related species of warm-blooded animals (endotherms), individuals tend to be larger in colder climates and smaller in warmer climates. This is due to the relationship between body size, surface area, and heat retention.

2. **Effect of Temperature on Organisms**: Temperature is a crucial abiotic factor that influences the physiological processes of living organisms. It affects enzyme activity, metabolic rates, and overall physiology, which are vital for survival.

3. **Surface Area to Volume Ratio**: Smaller animals have a higher surface area to volume ratio, which means they lose body heat more quickly than larger animals. Larger animals, with a lower surface area to volume ratio, retain heat more effectively, making them better suited for cold environments.

4. **Adaptations in Cold Environments**: Animals living in colder climates need to maintain a stable body temperature. Larger body size helps in minimizing heat loss, as they can generate and retain heat more efficiently than smaller animals.

5. **Conclusion**: According to Bergmann's rule, the correct statement is that animals in colder areas tend to be larger than those in warmer areas. This is because larger animals lose heat more slowly due to their lower surface area to volume ratio.

**Final Answer**: The correct statement regarding Bergmann's rule is: "Animals of colder areas generally have larger sizes than those in hot areas."

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