My thought process is that, after enough time, an invasive species of some plant or animal would find its way into its new ecosystem, and properly become a part of the ecological cycle? Does this ever happen? Maybe it just needs far more time to do so?
Whether or not a species is invasive depends on if it can fit into the ecological cycle. Not all non-native species are invasive. Bees, earthworms and some horses are not native to the Americas but are generally not considered invasive species.
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