21. According to the data in this chart, which two food plants were introduced to the Americas as part of the Columbian Exchange?

A. Corn and squash

B. Tobacco and coffee

C. Horses and rice

D. Oats and wheat

If anyone has done this test or knows this answer please help, I attached a photo

name two ways organisms join a population and two ways organisms leave a population. two ways organisms join a population are birth rate and immigration. two ways they leave are death rate and emigration.

explanation:

hi!

your correct answer would be a

~courtney

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)

the answer is c. hope this