Since Western and Eastern meadowlarks are similar in appearance, one could assume that both are members of the same species.  However, the Western meadowlark sings a song that is distinct from the Eastern meadowlark, preventing the two from mating. Therefore, one could also assume that Western and Eastern meadowlarks each represent their own species.  Identify which concepts characterize both assumptions.

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Terrestrial Ecosystem

An ecosystem is a collection of interconnected communities. It includes both living and non-living elements of specific strata. The terrestrial ecosystem is solely related to the ecosystem present on the land and covers 25 to 30% of the total earth’s surface area.