Which of the following features adapt polar bears to live in extremely cold climate ?

Options

A. A white fur, Fat below skin, Keen sense of smell.
B. Thin skin, Large eyes, A white fur
C. A long tail, Strong claws, White large paws
D. White body, Paws for swimming, Gills for respiration

Answer

### Step-by-Step Solution:

1. **Understanding the Environment**: Polar bears live in polar regions, which are characterized by extremely cold climates and minimal sunlight. This environment requires animals to have special adaptations to survive.

2. **Heat Retention**: In extremely cold climates, it is crucial for animals to minimize heat loss. Polar bears have developed specific features to help them retain body heat.

3. **Fur Adaptation**: Polar bears have at least two layers of fur. This fur is greasy, which prevents water from sticking to their bodies when they swim. This adaptation helps reduce heat loss due to water exposure.

4. **Fat Layer (Blubber)**: Beneath their skin, polar bears have a thick layer of fat known as blubber. This blubber provides insulation, further reducing heat loss and helping them stay warm in frigid temperatures.

5. **Keen Sense of Smell**: Polar bears possess an excellent sense of smell, which allows them to detect prey (like seals) from distances up to 32 kilometers. This adaptation is crucial for hunting in their harsh environment.

6. **Camouflage**: The white fur of polar bears helps them blend into their snowy surroundings, making it easier for them to hunt and avoid detection by both prey and potential threats.

7. **Conclusion**: The features that adapt polar bears to live in extremely cold climates include their white fur, a thick layer of fat (blubber), and a keen sense of smell. Therefore, the correct answer is the first option: white fur, fat below skin, and keen sense of smell.