The overall form of the aria "News" from Nixon in China is free, but there is an element of ____ form present

Dan Emmett, who wrote "De Boatmen's Dance," was a member of:

a. The Christy Minstrels b. Bones and Tambo duo c. The Virginia Minstrels d. The Virginia Vaudevillians

What is a cylinder seal?

What will be an ideal response?