The first was walled cities. Another is both offensive and defensive was a fleet of warships. And a third was alliance with other cities.
Answer:
Mikhail Gorbachev.
Explanation:
Mikhail Gorbachev became the first president of the Soviet Union in 1990 and received Nobel Price for promoting peaceful international relations and ending Cold War. Gorbachev's key political changes included a more democratic system of elections. He abolished the special status of the Communist Party, as set out in the constitution of the USSR. State power was turned over to the USSR People's Duties Congress, the first parliament in the Soviet Union, based on democratic elections.
Answer:
The dual nature of light means that, in some experiments, light behaves as a wave. ... The light waves interfered with each other and formed an alternating pattern of light and dark bands; the light bands are the constructive interferences, and the dark bands are the destructive interferences.
