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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