Which brought the traditional way of life of plains indians to an end?
i. the reservation system.
ii. the disappearance of the buffalo
iii. the dawes act.

a. ii and iii
b. i,ii, and iii
c. i and ii
d. i

"The reservation system", "the disappearance of the buffalo" and "The Dawes act" are the reason that brought the traditional way of life of plains Indians to an end. The correct option among all the options that are given in the question is the second option or option "b". I hope that this is the answer that has come to your help.

Because the discoveries were some of the oldest human remains.