Which of the following describes a property of water that sustain marine life forms?
open spaces in water's solid structure makes its solid state less dense than its liquid state.
water contracts on cooling below 4 °c, lowering its density until it reaches 0 °c. water freezes from bottom to top, which allows it to form a solid layer of ice only at the bottom of rivers and lakes.
the low specific heat of water lets it cool down slowly, allowing aquatic animals to survive.

Open spaces in water's solid structure makes its solid state less dense than its liquid state.

Explanation:

Water unlike other liquids is special. It contracts when cooled, down to a temperature of 4°C but thereafter begins to expand as it reaches 0°C and turns into ice.This property is useful for the preservation of marine life in very cold temperatures. During winter, the surface water in water lakes and rivers starts cooling. Upon reaching the temperature of 4°C, the surface water descends to the bottom as it denser. This help in the maintenance of temperature of the water at the bottom at 4°C. It is in this layer that marine life is sustained.

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