Karen worries excessively about developing a rare disease. When she meets friends or writes letters to her relatives, she is constantly discussing how she feels and expresses concern that even the most minor irregularities in the functioning of her body are symptoms of underlying diseases. She spends a good deal of time consulting doctors for a second opinion.
Name the disorder

Anxiety

Explanation:

She is worried about what she has an is constantly discussing her problems meaning that she is very worried about them and she wants second opinions to make sure she does bot have the disease

it is due to the halo effect as the impression of the boy created earlier.on the mind of the principle affected his decision

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