The salinity of a brackish habitat can vary depending on the amount of freshwater and saltwater that mix together in that environment. Brackish water is a mixture of freshwater and saltwater, which can occur in estuaries, mangrove swamps, and other coastal areas. The salinity of the habitat may increase during the dry season when the water evaporates and the salt concentration becomes more concentrated. Conversely, it may decrease when there is a lot of rainfall and freshwater flows into the habitat, diluting the saltwater. Therefore, the correct answer is that the salinity of a brackish habitat increases during the dry season.