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Answer:
The Columbian exchange helped colonies by bringing them new crops and animals that would improve their nutrition and health.
It also harmed colonies by bringing deadly diseases like smallpox.
Explanation:
Some of the crops and animals brought to these colonies include bananas, cattle, citrus fruit, and various grains. These food items helped the colonies' populations grow and improve their nutrition.
However, diseases like smallpox, influenza, and measles were deadly because the colonists did not have any natural immunity to these diseases since they had never encountered them before. These diseases killed millions in years.