Answer:
The answer for question 1 is A) Logs, diaries and letters.
The answer for question 2 is D) Native american cultures.
Step-by-step explanation:
As exploration did not provide the writer with much tools, they had to work with diaries, letters, and logs. Also, letters were crucial as they used to write down all they saw in order to tell other people, and it became, somehow, a traveling journal with an addressee.
All three words mentioned in the second question have common insights with nature, as pecan and hickory are trees and savanna is a field with little to no trees. This way it's possible to understand that these words were related to people very close to nature that could possibly be Native American.