21. Opportunity
cost functions at all levels of business.
a. True
b. False

True

Explanation:

i want to say death; parole, probation, and fines are still being used all the time.

chronological thinking is an indispensable tool to structure a historical narrative and to give meaning to a sequence of events. the final section presents the results of a survey to test the chronological thinking of lower secondary school students carried out by the educational research institute.