David has issues with delinquency, hard drug use, and aggressive-bullying responses to frustration. if tested, david's level of is likely to be higher than average but will decline with old age.

The answer is testosterone levels. Violent criminals have a tendency to be: well-built young males, low IQ, low points of serotonin, recklessness, and greater than average testosterone levels. High testosterone levels relate with irritability, low lenience for hindrance, and impulsiveness also high testosterone levels relate with delinquency, hard drug usage, and aggressive answers to frustration.

  b.

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