1. The correct answer is a. malnutrition. Malnutrition can occur due to changes in appetite and eating habits associated with drug abuse. Other options like mental illness (b) and impaired judgment (c) are mental effects, while confusion (d) can be both a mental and short-term effect.2. The correct answer is d. anxiety. Anxiety is a well-documented mental effect of drug abuse. Liver and kidney damage (a) are physical effects, impaired judgment (b) is a cognitive effect, and disrupted family life (c) is a social effect.3. The correct answer is c. depression. Depression is an emotional and mental effect of drug abuse[. Insomnia (a) is a physical effect related to sleep disturbances, psychosis (b) is a severe mental effect, and marital separation (d) is a social effect.4. The correct answer is a. violence. Violence can be a social consequence of drug abuse due to impaired judgment and aggressive behavior. Nerve damage (b) is a physical effect, and disorientation (c) is a short-term mental effect.5. The correct answer is a. changes in behavior and normal attitudes. Changes in behavior are common signs of drug use and abuse. Eagerness to learn something new (b) is not typically associated with drug abuse, happy individuals (c) might not necessarily indicate drug use, and suspiciousness (d) can be a symptom but is less specific than changes in behavior.