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Cassava, or manioc, another American food crop introduced to Africa in the 16th century as part of the Columbian Exchange, had impacts that in some cases reinforced those of corn and in other cases countered them
The correct answer would be D His work on gravity.
He developed the theory of universal gravity which we know as the inverse square law. He thought of 3 laws of motion and proved them by using mathematics. he investigated the planets movements.
Answer: The Department of State
