A lowland area, such as a marsh or swamp, that is saturated with moisture:

• A. Wetlands
• B. Aphotic zone
• C. Limnetic zone
• D. Intertidal zone

Answer: (A)

Wetlands are ecosystems defined by water-saturated soils for at least part of the year, which creates hydric soils and supports vegetation adapted to saturated conditions. A marsh or swamp in a lowland area fits this description perfectly because the land remains inundated or consistently moist, shaping the plant communities and soil conditions unique to wetlands. This differentiates wetlands from the aphotic zone (the deep, dark part of a body of water where light is scarce), the limnetic zone (the open, well-lit surface layer away from the shore), and the intertidal zone (coastal areas exposed to air at low tide). Wetlands play key roles in flood control, water purification, and providing diverse habitats.