Remember to wear knee pads and wrist guards, when you ride your skateboard.
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!
Answer:
"Author's claim is honorable presentation of an author that he makes in his writing – to some person or his memory, group of people, establishment or even abstract idea. As it is seen from one epigram of Martialis, such statements were known back in Roman times."
Explanation:
Hope this is helpful :)