Human population by itself is only part of many ecosystems, on both the local and larger levels. Humans obviously can’t exist without interacting with plants and animals, so human population on its own can’t be considered a complete ecosystem. An ecosystem is defined as “a unit of interdependent organisms which share the same habitat,” therefore humans only make up one piece of the overall picture. Even in man-made habitats such as cities, there are countless other organisms which share our space.
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