How about this. Point Mugu is a naval base built on the site of a Japanese-American fishing village. They scooped out the muck from a creek, and piled it next to the creek as the foundation for a concrete runway. That left a bay that had different degrees of salinity depending on the tides. At low tide, it is nearly filled by fresh water from the creek. At high tide the water is nearly filled with salt water from the ocean. In between, the water has various degrees of salinity.
What would ID suggest we would find if we looked at crustacians? Would it not suggest that we found only species that were found anywhere else around the world?
I have no idea what ID would suggest. I have no interest in ID.
Why is it so difficult for you to answer a question.
You keep trying to reiterate concept, which is given.
I am looking for some substance and disclipine, not exposition on concept.