Aquatic animals are able to survive in water bodies like rivers and oceans during winter when the atmospheric temperature is `-10^(@)C`. This is because

Options

A. density of ice is less than water.
B. density of water is minimum at `4^(@)C`.
C. ice is a poor conductor of heat.
D. both 1 and 3.

Explanation

### Step-by-Step Solution:

1. **Understanding the Environment**: Aquatic animals live in water bodies like rivers and oceans. During winter, the atmospheric temperature can drop significantly, sometimes reaching as low as -10°C.

2. **Behavior of Water**: Water has unique properties that allow it to support life even in cold conditions. One of the most important properties is that water is denser than ice.

3. **Ice Formation**: When water freezes, it turns into ice. However, ice is less dense than liquid water, which causes it to float on the surface. This means that the water beneath the ice remains in a liquid state.

4. **Insulation Effect**: The layer of ice on top of the water acts as an insulating barrier. It prevents the cold air from directly cooling the water below, allowing the aquatic animals to survive in the warmer water beneath the ice layer.

5. **Heat Conductivity**: Ice is a poor conductor of heat, which means that it does not transfer heat efficiently. This property helps to maintain a relatively stable temperature in the water below the ice, providing a suitable habitat for aquatic life.

6. **Conclusion**: Therefore, aquatic animals can survive in water bodies during winter, even when the atmospheric temperature is extremely low, due to the lower density of ice compared to water and the insulating properties of ice.