Members of congress employ staffers to them a: work with constituents b: do research and write bills c: stay informed about upcoming bills d: all of these

D: all of these

Explanation:

United States Congress is the depository of the United States legislative power. It is a bicameral body, composed of the House of Representatives and the Senate.

The House of Representatives has 435 members representing a congressional district they serve for a biennium. The positions are divided according to the population of each state. Currently, its number does not grow, although in the beginning, one representative corresponded to every 30,000 people.

In contrast, each state has two Senators, regardless of their population. There are 100 senators, who serve at least one six-year term. Both the representatives and the senators are now elected by the people, although in some states the governor can substitute in the event that the position of a Senator in his state is vacant.

it affected it because the kingdoms (with trade) slowly got richer and richer.

the steam engine.

the locomotive.

the telephone.

the telegraph.

the internal combustion engine.

the rifle.

ironclad ships.

electricity/light bulb.