A memoir is an experience or an event that happens to someone, the protagonist would be the person who wrote the memoir.
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A compare and contrast essay should identify complex details. Simple, basic, and unimportant details are all things that the reader can either figure out on their own or won't even need to know. Talking about the complex details really allows you to address all the points on what makes these two topics different from one another and what makes them similar.
The Portable Document Format is a file format developed by Adobe in 1993 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.