One president gave much power to the silver service commission he was a reformer and his reforms probably cost him the nomination for the second term

Chester Arthur was the president who gave much power to the Civil Service Commission.

Explanation:

Arthur worked as a reformer and his reforms gave him another chance as he got the nomination for second time. Civil Services Commission can be defined as the government agency, constituted by legislature.

The motive of framing this agency was to limit the employment and improving the working conditions of civil servants, oversee hiring, giving promotions, and promote the values of the public service. This agency was dissolved in 1979 due to the civil service reform act 1987.

(d) rivers.

explanation:

civilizations developed around rivers because their waters provided places to hunt and fish. also, as the rivers flooded, the lands around them became fertile. this allowed them to support farming. this is especially true of the nile river, which flooded the same time each year.