A mark or character that is used to illustrate a object, function, or process
The climax in Macbeth is Macbeth's murder of Duncan in Act 2 represents the point of no return, after which Macbeth is forced to continue butchering his subjects to avoid the consequences of his crime.
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I think it is C.
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Planned fires reduce dangerous fuels, Prescribed fires nourish the soil, and the habitat for endangered animals improves after prescribed fires.