Why are non native species with invasive traits a threat to ecosystem

Any ecosystem is designed with a particular necessity that drives it's entire organisms that is residing in the particular ecosystem. Invasion by other species would deprive the initial nutrients that are contained in an ecosystem for it's native species.

This in turn would gradually make the native species extinct. The ecosystem contains all the nutrients that are enough for its residents and it is perfectly balanced by the nature, but invasion of a non-native species would break the natural balance and create deficit.

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.

is this a question? wassup