Ecosystems are the combination of living organisms (biotic) and the non-living components (abiotic).
Ecosystems are an important level in the hierarchy we use to understand ecology.
Living organisms have many important interactions with othe rliving organisms and the non-living components of the areas in which they live.
The predator-prey relationship that exists between moose and wolves is an important interaction that exists between living organisms. Learn more about this relationship and the on going study of these populations on Isle Royale .
The impact of climate change (abiotic) on moose population in areas like northern Minnesota is a god example of how living organisms interact with non-living components of the areas where they live. The moose population has declined significantly in the past decade as seen in the graph below.
This video provides additional information about the levels of organization used in ecology.
Hope this helps!