Which ecosystem is characterized by areas along rivers and streams in the Grand Canyon?

The riparian ecosystem is characterized by its proximity to rivers and streams, making it distinct in its biodiversity and ecological significance, particularly in environments like the Grand Canyon. This ecosystem is typically rich in moisture and supports a unique array of plant and animal life that relies on the water bodies for survival. Riparian zones often feature lush vegetation compared to the arid surroundings, playing a crucial role in stabilizing banks, filtering pollutants, and providing habitat for various species, including birds, fish, and other wildlife.

Other ecosystems, such as desert, forest, and grassland, while they also contribute to the Grand Canyon's overall ecological structure, do not specifically describe areas adjacent to water bodies. The desert ecosystem is characterized by dry, arid conditions; the forest ecosystem includes denser tree cover typically found at higher elevations; and the grassland ecosystem involves open spaces dominated by grasses. Thus, the riparian ecosystem is the most appropriate choice for areas along rivers and streams within the Grand Canyon, highlighting the importance of water in shaping local biodiversity.