An effect of the diseases that were part of the Columbian Exchange was that:
O
A. Africans brought to America lacked natural protection to disease.
O
B. Native American populations returned to their original size after
years of exposure to disease.
O
C. Europeans settling in American lacked natural protection to
disease
D. Europeans took advantage of Native American societies
weakened by disease.

Europeans brought deadly viruses and bacteria, such as smallpox, measles, typhus, and cholera,

option D. i think sorry if its wrong..

Explanation:

hope this helps!

battle of saint-mihiel, (12–16 september 1918), allied victory and the first u.s.-led offensive in world war i. the allied attack against the saint-mihiel salient provided the americans with an opportunity to use their forces on the western front en masse.

explanation:

b) brahmans   is nomadic society