Which habitat would have the least variation in its salinity?. a ... salt marsh. b ... mangrove forest. c ... lake. d ... estuary

The salinity in salt marshes and estuaries is highly variable considering the flow of both fresh and saltwater into the body of water especially at the mouth where seawater flows. Mangrove forest exist only in high saline environment. Lake is a closed type body of water so it is expected with the least variation of salinity.