Answer:
Christopher Columbus introduced horses, sugar plants, and disease to the New World, while facilitating the introduction of New World commodities like sugar, tobacco, chocolate, and potatoes to the Old World. The process by which commodities, people, and diseases crossed the Atlantic is known as the Columbian Exchange.
Explanation:
Dr.Livingston is a doctor or a archaeologists that ether helps people or does research around the world.
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World War II is generally said to have begun on 1 September 1939, with the invasion of Poland by Germany and subsequent declarations of war on Germany by France and the United Kingdom. ... On 22 June 1941, the European Axis powers launched an invasion of the Soviet Union, opening the largest land theatre of war in history.
