The importance of United Nations comes from the idea that all men are created equal and deserve the same human rights, as well as the rights to life, liberty, and the pursuit of happiness. The United Nations' job is to ensure that these liberties and freedoms are existent in the entire world, since the Declaration of Independence does not apply to all the people in the world. They prevent things like oppression and human rights violations.
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It's "C: A cobra; the snake foretells a warning of danger to come." Kali mentions that they are sacred and should not have been killed. This foreshadow represents a warning.
C leper wants to Impress his classmates by being the first to enlist