The correct answer to this open question is the following.
Here there is no question, just a sentence. What is your question?
Trying to help we did some deep research and can comment on the following.
The question that is missing is this: "Which of the following is most likely a lens he is exploring?" And unfortunately, you also forgot to include the options for this question.
As part of his research on the Civil War, Charlie is reading a book about ironclads (a type of boat) and how they revolutionized naval warfare. The lens. Which of the following is most likely a lens he is exploring?
Answer: the lens of technology.
This is correct because ironclads were a major advancement in the technology of war. Ironclads were modern ships for the time that used steam to move, They were constructed in 1859 and played an important part during the actions of the American Civil War.
maybe 5-6 hours a day too much can be bad . . .. . . . .
Answer:
thực dân Pháp xâm lược Việt Nam (1858-1930)
They started domesticating wheat. This wasn't their main feat however since they also started herding sheep and domesticating goats. These two enabled them to stop moving around like nomads and make a real civilization in the area which resulted in what is now known as history.