Who were the Bulgars? (4 points) An Eastern European tribe that killed the Byzantine emperor
An empire that conquered Constantinople after a month of fighting
A Germanic tribe who fought with the Byzantines for lands in Italy
A group from Eastern Europe who at first defended the Byzantines

Which of the following discoveries would be most likely to cause a scientific paradigm shift? a. the discovery of more rings around uranus b. the discovery of a new pathogenic virus transmitted by mosquitoes c. the discovery that a dormant volcano is showing signs of activity d. the discovery of a new species of salamander in the amazon rainforest e. the discovery that excess heat is radiating from the center of the earth and causing global climate change