The Zhou dynasty lasted longer than any other Chinese dynasty. Which of the achievements listed below occurred in China during the reign of the Zhou? Check all
that apply.

a. they invented the number zero and Arabic numerals

b. they learned how to smelt & cast iron resulting in better tools and an increased
population

c. they used copper coins, carried on a string for currency

d. Confucianism & Daoism emerged as dominant philosophies

e. the people were united with a common, written language of Chinese characters