Part 3: Includes NRI code to test Darwin's Naturalization Conundrum, as well as GBIF data to run code

GBIF data is necessary to run this code. See Part 2 folder, as it is all the same info. This script is the same as NRI-PT2-022825, except for one primary difference. This includes the “add.inv.sp” function, which includes the invasive species in NRI calculation, even if it was not originally in the transect list. This way we are seeing relatedness of the invasive species to the rest of the community.