People think the earth is flat because it seems hard to fathom that you can still stay on the earth if you're on the North Pole. This theory, that the earth is flat, was well known for hundreds of years. The vikings were the first to figure out that the earth is not flat, though Christopher Columbus gets the credit.
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First one is c, and the second one is b.
Answer:
number 10 should be the second one
Explanation:
9 would be to stop the spread of communism
He was the running mate of Dwight D. Eisenhower, the Republican Party presidential nominee in the 1952 election. Nixon served for eight years as Vice President, becoming the second-youngest vice president in history at age 40.
Answer: Because they had never developed immunities to the disease