I believe it's unknown since the Mississippi is the predicate and unknown is a describing word, a.k.a. an adjective but I'm not sure
Good luck, hope I helped!
The farmer told the students they were welcome to come back at anytime!
It is the reason something exist for example if you ask what the purpose of a car is you would say its purpose is to get me from one place to another.
You forgot to include the pictures but ok
