apply - v. to have an effect on someone or something

challenge - n. something that is hard to do

elder - n. a person who has authority because of age and experience

instruct - v. to teach (someone) a subject, skill, etc.

psychologist - n. a scientist who specializes in the study and treatment of the mind and behavior

subsistence - adj. where people produce food to eat themselves rather than to sell.

tobacco - n. a plant that produces leaves which are smoked in cigarettes, pipes, etc.