Maria told her mother that she was sure she was going to be diagnosed with cancer someday because every news report she heard talked about how the food you eat causes cancer and the electronics you use cause cancer. which theory explains maria's belief?

The correct answer is: cultivation theory

Explanation:

Cultivation theory, composed by G. Gerbner, studies the long-term effects that television and media has on the audience, specifically on the viewer's attitudes. The main idea of the cultivation theory goes around the notion that TV viewers cultivate attitudes believing that the world created (or reproduced) by TV programs is an accurate depiction of the real world, influencing perceptions of the audience.  

depends on what they need

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