How did the introduction of the horse change the lives of the plains Indians? Was the change positive, or negative? Explain your answer. PLEASE HELP!

Which of these is one right guaranteed by the aha's patient bill of rights? a. the right to remain on your insurance plan. b. the right to appeal denial of coverage for a procedure. c. the right to be treated with respect. d. the right to have insurance even with preexisting conditions.