Answer
Water's density behavior upon freezing and its high specific heat capacity
Work Step by Step
When water freezes it expands, meaning that ice is less dense than water and floats to the surface.
This creates a barrier between the water below the surface and the cold air, which stops the rests of the water from freezing, meaning the flounder is able to survive the very cold climates.
Also its high specific heat capacity helps as water can absorb or release large amounts of heat with only a small change in temperature. This means oceans resist rapid cooling, even when the air is very cold.
