On average, children who attend schools for gifted students have lower self-esteem than children of equal intelligence who attend regular schools with students of widely varying abilities. if we consider research about factors affecting youngsters' sense of self, we can explain this finding in which one of the following ways

Self-esteem is built based on children's interactions with the environment. People often compare themselves to others, whether subjectively, by judging themselves versus someone else, or objectively, like comparing test results. In a regular school, where intelligence follows a close to parametric distribution, those is the highest percentiles have very positive comparisons with their peers, thus boosting their self-esteem. In gifted school where the distribution of intelligence is more flat, students often lack the reinforcement of over performing and getting that positive comparison.

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