First European to reach the Americas

Which statement best completes the diagram of the ways the different branches of government can limit each other's powers?

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

Which groups of people most directly benefited from song innovations in the song dynasty‘s open border policy?