<span>b. heart of darkness
Marlow wants to explore these blank spaces and go to a place no one has ever been. However, he realizes that these blank spaces keep getting filled in. More and more people are exploring the blank spaces and completing the map. This relates to one of the main ideas explored in the novella - the topic of imperialism.
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I think you can look at summaries on the internet I have not read the book
I believe the answer to be a XD hope i helped correct me if i'm wrong.
Different dogs with different features have unique treatments and learning styles