Which of the following ecosystems includes wetlands?

Wetlands are unique environments that can be classified under freshwater ecosystems. They are areas where water covers the soil, either permanently or seasonally, and they play a critical role in biodiversity, water filtration, and flood control. Freshwater ecosystems include rivers, lakes, ponds, and wetlands, resulting in a diverse habitat that supports various plant and animal species.

Marine ecosystems refer to oceanic and coastal areas that are saline rather than freshwater. Terrestrial ecosystems consist of land-based environments, such as forests, deserts, and grasslands, where wetlands do exist but are not the primary component. Aerial ecosystems are not a recognized category in environmental science; instead, they might refer to birds or other organisms that fly but do not encompass the definition of a complete ecosystem type.

Hence, the correct association of wetlands with freshwater ecosystems highlights their essential characteristics as habitats primarily characterized by the presence of freshwater, making freshwater ecosystems the appropriate choice.