Answer:
d.
researching a topic before going to discussion on it
Explanation:
That is a Perspective Question. Only personal examples can be given in response and will consist entirely on personal experiences. anything not experienced or witnessed 1st hand will be complete speculation and therefore leave the answer in the state of Theory.
The answer would be "to help you decipher symbols and scale."
Without the key, a lot of the symbols would be quite confusing and you wouldn't know if it was 5 miles or 500 miles. Everything else is implied throughout the map, but the key's purpose is definitely to help you decipher symbols and scale.
Answer:
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