This quote to me means that we should accept people how they are, and not try to change them to our benefit, but instead adapt to how they are. I think the author put in this quote because he wanted to tell use how Mars may be different, but we should still accept it, and deal with it, not change it to fit our needs.
The answer to the question that is being presented above would be letter c. The boys chattered about their fishing trip inside their tent. This sentence contains a misplaced modifier because it seemed like the fishing trip was conducted inside their tent.
To entertain each other, to pass along elements of culture.
There could be more but those are my guesses
