Ahistorian is awarded a grant to study the effects of industrial air pollution in sugurcane farms in brazil. his research will focus on which major historical theme?

option a

explanation:

to cleberate the end of their war

answer: in october 1962, an american u-2 spy plane secretly photographed nuclear missile sites being built by the soviet union on the island of cuba. president kennedy did not want the soviet union and cuba to know that he had discovered the missiles. he met in secret with his advisors for several days to discuss the problem.

explanation:

the correct answer is b, "fertility rates are increasing, so populations will grow more quickly in the future."