Invasive species pose a significant threat to ecosystems for several reasons, and out of the options provided, the most comprehensive threat is:
Invasive species can do intense damage, so much so that ecosystems may not be able to recover.
This option highlights the potential irreversible damage that invasive species can inflict on native ecosystems, which can lead to loss of biodiversity and the collapse of local habitats. Other options, while valid points, don't encompass the overall impact of invasive species on ecosystems as effectively as this one.