The principle difference between where salt marshes and mangrove forests grow is
a. the salinity of the water
b. the amount of sunlight the plants receive
c. the intensity of the waves alongthe coast
d. the extent of human development in the area

The answer is A. the salinity of the water. Salt marshes are coastal wetlands found throughout the world on protected shorelines and on the edges of estuaries where freshwater mixes with seawater. [ Mangrove forests are those which contain Mangroves which are trees and shrubs that grow in saline (brackish) coastal habitats in the tropics and subtropics. ]