What were the main causes of the decline of the Roman Republic? Will give brainliest please and thank you loves have a great day

a
Constant war and invasion from others - internal conflict within the government system
b
Military conflict within the conquered lands - dishonest elections
c
Corrupt leaders - poor farmers moved to the city - too much land to manage
d
Too many people in the cities - corrupt leaders - super large empire

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