Which term describes the flow of materials, energy, and organisms between two ecosystems?

The term that describes the flow of materials, energy, and organisms between two ecosystems is "landscape." In ecology, a landscape encompasses a variety of ecosystems and biotic communities within a specific area and characterizes the patterns of landforms, vegetation, and ecosystems interacting with each other. These interactions can include nutrient cycling, energy flow, and the movement of organisms between different ecological systems, highlighting the connectivity and interdependence of different ecosystems.

This concept is vital in understanding ecological processes, as landscapes can facilitate or restrict movement and exchanges that are crucial for biodiversity and ecosystem health. Regions, biospheres, and populations pertain to different ecological scales and definitions, but they do not specifically address the interconnectivity and exchange occurring between distinct ecosystems as a landscape does.