If the densities of ice and water were reversed the living organisms inside the lakes would?​

This allows many aquatic life forms to survive through the winter. If ice were more dense than water, it would freeze and sink over and over until the entire lake was frozen. This would eliminate many aquatic organisms and produce a system with far fewer life forms in lakes which freeze periodically.

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blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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