Can someone plz help me? :)

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.

What notable contributions to science has sandia national labs (snl) produced over the years?

What was one of the primary wsu’s islam’s golden age impacted the european renaissance