Which effect did the columbian exchange have in the americas? a. spread diseases b. decreased warfare c. increased indigenous populations d. introduced maize

A.Spread diseases

Explanation:

The Colombian exchange is a process that took place between the 15th and 16th centuries, when agricultural products and other foods from the New World (the American continent) were discovered in the Old World (Europe, Africa and Asia) and vice versa. broad also includes technological advances, demographics and even diseases.

increases in demand are shown by a shift to the right in the demand curve. this could be caused by a number of factors, including a rise in income, a rise in the price of a substitute or a fall in the price of a complement.

which the answer is:

b