While class systems are based in part on a person's birth, or class of their parents, an important difference between caste and class systems is that class systems also incorporate the concept of personal in determining one's social position.

Personal achievements

Explanation:

While class systems are based in part on a person's birth, or class of their parents, an important difference between caste and class systems is that class systems also incorporate the concept of personal achievements in determining one's social position.

In caste system, an individuals social class is already determined at birth, whether poor or rich. However, in class systems, an individuals achievement is important in determining his/her social class. For example, a janitor can be hardworking, gets educated and become successful and thus changing his/her social class, while a child born into affluence may be wasteful and end up poor thus experiencing a downward social mobility.

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