how black and white film works

I'm taking advanced photography in high school this semester. The project that I was assigned was to give a presentation, with handouts for all other students, on ~black and white film...and how it works~ All I have found so far is how to develop film. We already know how to do that. We learned that in basic photography. I'm suppose to tell how it works. If you have any information at all, it would be greatly appreciated. Thanks

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