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Question:

How does the introduction of a new organism affect an ecosystem?

A Ecosystems function interdependently; the introduction of a single new organism results in drastic changes.
Explaination

Ecosystem does not describe independent systems, but interdependent ones. For this reason, a new addition to an ecosystem can have drastic effects on the overall form and function of that system. Although they are fragile, the introduction of a new organism does not guarantee failure, and although they are equipped to adapt, they are not capable of adapting to each and every foreign organism.