This passage indicates how important ___is for this Native American leader

answer; when one group has an extremely high score at pretest;

  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.

i believe the answer is: returns on investments, no wages

people who belong in upper class society would most likely get there by obtaining multiple source of income, which a certain percentage of ownership for businesses. since most of them are job creator, they would most likely get their money from profit, not wages.