After being rejected by all the medical schools she applied to, melanie developed a sad and dejected mood. she had difficulty sleeping, ate much less than normal, no longer took interest in the hobbies and activities that once gave her pleasure, and felt that she was worthless. melanie would be diagnosed as suffering from:

The fact that Melanie developed a sad and dejected mood, had difficulty sleeping, ate much less than normal and is no longer took interested in the hobbies and activities that once gave her pleasure suggests that Melanie would be diagnosed as suffering from depression.

This mood disorder, characterized with a persistent feeling of sadness and loss of interest, negatively affects how an individual feels, the way he/she thinks and how he/she acts.

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