For this one I'm not pretty sure but the one that makes the most sense to me would be D sorry if its wrong
Answer:
The Columbian exchange, also known as the Columbian interchange, named after Christopher Columbus, was the widespread transfer of plants, animals, culture, human populations, technology, diseases, and ideas between the Americas, West Africa, and the Old World in the 15th and 16th centuries.
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Answer:
D: international efforts to reduce the effects of climate change
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