Why did disease decimate the indigenous populations of the western hemisphere?
a. the western hemisphere had developed in relative isolation from europe, asia, and africa for thousands of years, so the people had no natural immunities to diseases from the eastern hemisphere.
b. the peoples of the western hemisphere did not have access to the more sophisticated medical tradition and practices of the asians and the europeans so they had no way to combat the diseases.
c. the peoples of the western hemisphere were weakened from fighting the european invaders, so they were not biologically strong enough to fight the diseases
d. the peoples of the western hemisphere lacked the sanitation and technology needed to prevent the spread of infectious disease acquired from contact with the europeans, so diseases spread too rapidly to combat