Mayumi is a 17-year-old whose mother sought psychological treatment for her because of Mayumi's feelings of anxiety. Mayumi and his mother both report that Mayumi always needs to be doing something but that all the activity causes her to feel very tired. In addition, no matter how much Mayumi eats, and she seems to eat a lot, she loses weight.

Hyperthyroidism

Substance abuse

Explanation:

Hyperthyroidism is the situation in the body when the production of thyroxine hormone is made in huge quantities. The metabolism of the body is accelerated and because of this reason the body fails in gaining weight even after a good consumption of food.  

In the given situation, Mayumi's psychological symptoms of hyperthyroidism and substance abuse needs to be examined. The weight loss even after a good consumption of food is evident of such an issue.

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