In general, why might ecologists be concerned when new invasion species arrive in an ecosystem?

In general, why might ecologists be concerned when new invasive species arrive in an ecosystem? Like terrestrial environments, coral reefs can be damaged by invasive species. Reefs are also impacted by disease-causing bacteria, humans, and other biotic factors, or living parts of the ecosystem.

Explanation:

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emerging idea only occurs as a raw idea that could appear out of nowhere. meanwhile, to reach scientific consensus , that idea must be structured and tested over and over again through various experiments. the scientific consensus transforms the raw idea into idea that is more reliable through the process of scientific elimination.