IM SO CONFUSED what is a n u d e descending staircase?!?!? Was N u d e Descending Staircase serious, a spoof, or both? What did Duchamp bring to Cubism that had not previously been seen?

What happened 10 million years ago? if u answer, u get 50 ! plz answer ; -;

•the impact of enlightenment ideals on the development of economic, political, and religious structures in the western world

The massacre at sand creek was an attack by a colorado militia on peaceful american indians. a colorado militia on a group of dakota warriors. american indians on peaceful white settlers. federal soldiers on a group of cheyenne warriors.