u/Im_Here_For_Ocean

I know that a native species is a species that lives in an area naturally. But how long does a species have to live in that area until it 'becomes native'? Eventually, the ecosystem will adapt to include that organism, right? So would it become native then, or will it never be native if humans introduced it there?

The whole reason I thought of this question, is because I was trying to figure out where, if anywhere, humans are 'native' to. So if anyone has thoughts on that, I'd like to hear that as well.