12. When water freezes, it becomes less dense and thus floats. Why is this important to life?

A) Many wastes can dissolve and be carried away from the cell.

B) It makes a nice surface for figure skaters to frolic upon.

C) Floating ice acts as an insulator, so organisms can survive the moderate temps below the ice.

D) On earth, water rarely boils, so life is more likely to survive.

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Slichter