What do the darker, colored-in areas on the continent represent on the map?
a) countries
b) peoples
c) wet and dry regions
d) bodies of water

 C) wet and dry regions

Explanation:  Colours that are used to represent the relief and certain characteristics on the map by the cartographers are consistent. This means that for the display of certain differences on the relief or in the characteristics, gradually the shades of a certain colour change to show these differences. Thus, when continents are displayed on physical maps, certain colours are used to display specific surfaces with their own characteristics. The altitude as a relief feature is reflected in darker colour if the altitude is lower, and the brighter/lighter colour if it is higher. However, it should be borne in mind that, for example, the Mojave Desert , which is reflected in a darker green colour due to lower altitude, is not necessarily covered by crops. Or if it is flat, at a higher altitude, shown in a lighter colour does not mean that there is snow on it. Usually dry or wet areas are at lower altitudes and are shown in darker colours.

porter is writing economic history because he is focusing on the cost of developing vaccines.