Central message is what's the point of war. With that in mind I'll let you do your homework.
Not sure of second one maybe both
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I would say that equality in hunter-gatherer societies has a huge implication for the modern world.
The hunter-gatherer societies were the "original" societies, to which the humans evolved and the finding that the societies were much more egalitarian (both in terms of gender equality and social class equality) means that people cannot claim that inequality is somehow "natural" - it supports the need for equality in the modern world.
Questions with the word "how" in it allow the reader to understand what is happening in a given situation.
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Since a participle takes the form: verb + -ing, the only word in this sentence which has such a form is B, 'challenging'. 'Puzzle' is a noun, 'crossword' is an adjective, 'created' is a verb.
I believe that the attitude of the speaker would be defiant. Go to the following web site for much more information, because it helps to explain it in details.