What are the factors in the melting and changes in Polar ice?

Needed fast 15 points the process of natural selection favors certain characteristics in organisms, while it selects against other characteristics. what would happen if there was zero variation between all of the organisms on earth? a.organisms would evolve to increase variety b.natural selection would operate faster c.less food would be available d.evolution through natural selection would not occur

This word for a bug or malfunction was popularized in the 1962 book into orbit by the mercury astronauts

As water is cooled from 4 c to 0 c its density