Why is it so difficult for species to leave their ecological niche?

Why is it so difficult for species to leave their ecological niche?,
By William Harris,
HowStuffWorks.com,

The term niche has acquired many different meanings over the years. For example, in some contexts, it describes a person's position in life or a specialized but profitable corner of the market. But many of us remember niche as a concept presented in biology class, when our instructors covered the chapter on populations, communities and ecosystems.
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