What is one function of a mangrove swamp? 

A)  It provides sites for shrimp production. 
B)  It provides sites for coral reefs to develop. 
C)  It collects salt for salt mining. 
D)  It traps sediments.

Mangrove swamps are known to trap sediments carried by rivers and ocean currents. The dense roots of mangroves slow the water flow allowing sediments to settle down and build up the swamp floor. This function helps protect downstream areas from erosion, maintains water quality, and provides habitats for various organisms. While mangrove swamps may also provide sites for shrimp production, and coral reefs may develop near the mangroves, the primary function of a mangrove swamp is to trap sediments. Salt collection is not a common function of mangroves.