Alice goes to see a rerun of Jaws (a movie about a vicious shark) a few days before she takes off to Florida on spring break. On break, she finds that she is now too nervous to spend much time actually in the water, since she is convinced that anything she sees in the water is a shark. Her heightened sensitivity is due to

Priming

Explanation:

Priming is the effect in which a person is exposed towards a stimulus due to which he/she tends to responds to a future stimulus .This effect is caused due to implicit memory which manipulates the thought and ideas of a person later.

According to the question, Alice's situation is describing about priming effect in which she watched a shark-related movie which acted as stimulus and created a later response where she was afraid to spend too much time in water due to the altered thought of presence of shark.

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