How are edge cities formed and how are they beneficial/detrimental?​

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 desert is found in the northern part of africa and covers 3.5 million square miles.

All of the following are good ways to evaluate written sources of information except: