A wetland can occur:

• A. Only in riverine settings
• B. Only in coastal zones
• C. All of these
• D. Only in deserts

Answer: (C)

Wetlands form where the land is regularly saturated with water or covered by shallow water, creating conditions that favor plants adapted to wet soils. That saturation can come from different sources, so wetlands aren’t tied to a single landscape. In river valleys, periodic floods keep areas waterlogged and support riverine wetlands. Along coastlines, tidal action and brackish or salty water create coastal wetlands such as marshes and mangroves. Even in deserts, groundwater discharge or seasonal rainfall can produce wet spots that host specialized vegetation. Because these different settings all can produce the necessary saturated conditions, wetlands can occur in riverine, coastal, and desert environments, so all of these is the best choice.