Why do cat and more wrap lines differently?

It seems that more adds line breaks, whereas cat does not. As a result cat results will change to fit the terminal window if I resize the window, whereas more results stay put with the line breaks added the first time. My question is why, and is there any way to make more behave like cat? (I really don't like this setting of more, when I copy I end up getting the line breaks that I don't want.)