Which event best identifies the beginning of the so called dark ages in europe 1.) rise of the arab empire 2.) spread of the bubonic plague 3.) fail of the roman empire 4.) initiation of the hundred years war

1.d 2.a c.!

during the 20th century, the role of the vice president has evolved into more of an executive branch position. now, the vice president is usually seen as an integral part of a president's administration and presides over the senate only on ceremonial occasions or when a tie-breaking vote may be needed.