An
ecosystem consists of the biological community that occurs in some locale, and
the physical and chemical factors that make up its non-living or abiotic
environment. There are many examples of ecosystems -- a pond, a forest, an estuary,
a grassland. The boundaries are not fixed in any objective way, although
sometimes they seem obvious, as with the shoreline of a small pond. Usually the
boundaries of an ecosystem are chosen for practical reasons having to do with
the goals of the particular study.
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