I've been asking myself the same question for years
Answer: The couplet allows for parallel form connecting the elements of thought.
Here are the connections:
God directs - from his head
guard him from on high- let ev'ry evil fly
The correct answer is C. When the Europeans introduced small pox, measles, typhus, and other diseases to the New World.
The Natives did not have the same resistance to these diseases like the Europeans did, and it is said to have wiped out up to 90% of the Native population.
The answer is flagellum; flagella