Which of the following innovations was discovered during the gupta empire in india?
algebra
smallpox vaccinations
the use of zero as a placeholder
all of the choices are correct

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 happened when people started to question traditional christian beliefs?

How else might the black hand have addressed its nationalistic aspirations