The North American Free Trade Agreement (NAFTA) had which of the following effects on United States-Mexican relations? A.
The United States was able to issue a series of tariffs on Mexican-made products.
B.
The United States sponsored Mexico to join the World Trade Organization.
C.
The agreement helped Mexico increase its oil exports to benefit the United States economy.
D.
The agreement led to important immigration reforms in the United States.

answer; (d) one tectonic plate plunges beneath another; (most common,convergent boundaries)

can you explain it better

the branch of biology that deals with the normal functions of living organisms and their parts.

the way in which a living organism or bodily part functions.

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