<span>experimental design.!!!!!!!!!</span>
Answer:
Image result for Who suffered the most from the Columbian Exchange
The impact was most severe in the Caribbean, where by 1600 Native American populations on most islands had plummeted by more than 99 percent. Across the Americas, populations fell by 50 percent to 95 percent by 1650. The disease component of the Columbian Exchange was decidedly one-sided.
Explanation:
Its B, scarcity of water decreasing is not caused by urbanization
I think that the answer is B. It was spread along the Silk Road during the Han Dynasty.
