When the president belongs to one political party and the Senate and the House of Representatives are controlled by another, the president's goals are harder to reach. As a result, the president may veto laws passed by Congress and use executive orders to create policies he or she agrees with. What prior knowledge could help you understand the meaning of this passage?
a- Who the current president is b- How long senators and representatives serve in Congress c- How politicians from different parties behave toward one another d- ow many executive orders are issued every year

uhh idk for sure but i think it makes it difficult to pump the oil through the oil rigs

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals