This road sign means: a)do not enter b) information c) yield the right-of-way d) the road becomes wider the sign is a trangular-shaped sign with the point facing downward, there is a thick red line surrounding the triangle and the inside contains the image of a smaller white triangle pointing down with the word yield printed side.

When cell phones were first entering the market, they were relatively large and reception was undependable. all cell phones were essentially the same. but as the technology developed, many competitors entered, introducing features unique to their phones. today, cell phones are only a small fraction of the size and weight of their predecessors. consumers can buy cell phones with color screens, cameras, internet access, daily planners, or voice activation (and any combination of these features). the history of the cell phone demonstrates what marketing trend?