An ecosystem (or ecological system) is a collection of organisms and the environment in which they live. Ecosystems contain dynamic interactions between plants, animals, microorganisms and their environment. These interactions work together as a functional unit and everything is interrelated.
Ecosystems can vary greatly in size. Some examples of small ecosystems are tidal pools, a home garden, or the stomach of an individual cow. (Yeah, that’s gross but it shows the variety of ecosystems. And, we’ve all attended conferences that felt like all the content and experiences were regurgitation—and not in a good way—of stuff we’ve already had.) Larger ecosystems might encompass lakes, farm fields or forests.
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Via Maria Cristina Terenzio