Which of the following statements describes a salt marsh?
a.
a salt marsh lies at the edge of the sea in tropical areas and is populated with red, black, or white mangroves.
b.
a salt marsh is an estuary where grasses and grass-like plants dominate.
c.
a salt marsh is like a sandy beach, but covered with mud instead of sand.
d.
a salt marsh contains loose, shifting sand and very little water

The answer is letter C. A salt marsh is like a sandy beach, but covered with mud instead of sand.
Salt marshes are coastal Wetlands. They are flooded and drained by salt water brought in by tides.  They are called salt marshes because the sand seemed to be marshy because the soil perhaps composed of peat and deep mud. Peat is waterlogged. It is root-filled and very spongy. Frequent submerging of salt marshes by tides which contains plenty of decomposing plant material, levels of oxygen in the peat could be very low.

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Ithink it would be choices a and b. hope this !