Question: One impact the Byzantine Empire had was .

A. They stopped the expansion of the Turks
B. They preserved Greek and Roman learning
C. They conquered the Islamic Empires
D. They reestablished the Roman Empire

How was rockefeller able to build his monopoly across the oil industry? he found newer and cheaper ways to refine oil, increasing his profits. he confined his business to ohio so he could buy all the refineries there. he bought up oil refineries, cut costs, and reinvested his profits in other refineries. he began to sell kerosene as well as oil, expanding his market.