Which of the following best describes what happened during Mikhail Gorbachev's leadership of the Soviet Union?
He succeeded Lenin and started the Great Purge and five-year plans.
O He led the Russian Revolution, ordered the shooting of Czar Nicholas the II's family, and started the
New Economic Policy.
O He negotiated with U. S. President John F. Kennedy during the Cuban Missile Crisis.
O He started the policies of Glasnost and Perestroika, he was the last president of the Soviet Union,
and the Berlin Wall fell while he was in power.

toi khong biet cau tra loi

the exodus of these people from constantinople contributed to the revival of greek and roman studies, which led to the development of the renaissance in humanism and science. byzantine emigrants also brought to western europe the better preserved and accumulated knowledge of their own greek civilization

the columbian exchange, also known as the columbian interchange, named for christopher columbus, was the widespread transfer of plants, animals, culture, human populations, technology, and ideas between the americas, west africa, and the old world in the 15th and 16th centuries, related to european colonization and trade following christopher columbus's 1492 voyage. invasive species, including communicable diseases, were a byproduct of the exchange. the changes in agriculture significantly altered and changed global populations. the most significant immediate impact of the columbian exchange was the cultural exchanges and the transfer of people between continents.

the new contact between the global population circulated a wide variety of crops and livestock, which supported increases in population in both hemispheres, although diseases initially caused precipitous declines in the numbers of indigenous peoples of the americas. traders returned to europe with maize, potatoes, and tomatoes, which became very important crops in europe by the 18th century.

the term was first used in 1972 by american historian alfred w. crosby in his environmental history book the columbian exchange. it was rapidly adopted by other historians and journalists and has become widely known.