Which extends from about the mean sea level to the high neap-tide line and is unvegetated?

• A. Dunes
• B. Barrier Flat
• C. High Salt Marsh
• D. Low Salt Marsh

Answer: (D)

The concept being tested is how vegetation changes with elevation in the intertidal zone. As you move from mean sea level upward toward the high neap-tide line, the area becomes more frequently inundated and experiences more salinity stress and waterlogging. The zone at the lowest marsh elevations—the part closest to mean sea level up to the high neap-tide line—often has the strongest tidal influence and can be unvegetated under stressful conditions. That's why this region is characterized as low salt marsh in this context. The other zones sit at higher elevations or are typically vegetated in this model, so they don’t fit the description of being unvegetated in that elevational band.