Question

1. when the brazilian government made contact, large numbers of these people died because..

a. drug runners now knew their location and took over their villages.
b. they contracted viruses their immune systems couldn’t fight.
c. both of these
d. neither of these

Explanation:

When the Brazilian government made contact with isolated tribes, the tribespeople often died because they had no prior exposure to common viruses (like those from outside their isolated groups), so their immune systems couldn't fight these new viruses. Option a is incorrect as it's not about drug runners. Option c and d don't fit as the main reason is viral infection (option b).

Answer:

b. they contracted viruses their immune systems couldn't fight.