One of the many unique properties of water is that its solid form (ice) is less dense than its liquid form. most substances become more dense when in solid form, because their molecules are more tightly compact. why is this property of water so important to life on earth?

The presence of hydrogen bond is one factor that explains the fact that ice floats over water because it has less density.

Due to this, rivers and lakes freeze from the surface whereas it is in liquid state at the bottom which allows the sea animals to survive even in colder temperatures.

Water makes up at least 70% of earth and 65% of our bodies and this property of water is essential for our lives as it maintains the survival.

answer; polycythemia is the correct answer;

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