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I'll be attaching a resume but I'd like to fill this out as well. To fit everything in the space I'll have to omit descriptions. Should I write it out as a paragraph (I was president of X club, completed research for professor X, and volunteered for XX) or just do fragments (President, X. Vice President, X. Student research assistant for X.)

Yeah, I realize it's an unimportant question and I'm guessing it doesn't matter. But I'd like to know what other people are doing/have done.