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When you're stating a claim in an argument, whether it's an essay or a speech, you want to make sure that it's clear and concise. This 'theory' is what you are going to spend your piece proving, so it should be strong and carefully thought out.
In general, cultures all over the world are similar. Each has their religion, language, tradition and practices and people. Culture only differs on who, what, why and how. All cultures have the same basic foundation but vary on these questions like Who are the gods of their gods, what are the practices that they must follow, what are the cultural distinction between man and woman and what are the language they used in communication.