What problems did the new boundaries in the Middle East calls as people found himself living in newly created countries

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

Witch one is it soo it the the question b.a,b,c,d

The primary agent of contact metamorphism is