What is the central idea of "Of Wolves and Men" from Pathways?

Ead this sentence from the evolution of useful things.the underlined phrases indicateaaking waterproof sandpaper would allow wet sanding,which in turn would cut down on dust, and thus be a greatmprovementpassing of timea directional change of positiona cause-and-effect relationshipsequence of events.save and exitmark this and retur