What is the downside of using the chronological format

Wikipedia, in itself is an unreliable source of information for 2 reasons. Reason number one, It can be edited by anyone who goes on the site. This can cause an array of problems for someone who doesn't know any better. Reason number two, people who post accurate information may not know what they're talking about. This can lead to false information and if you're researching a topic you can fail the assignment. Those were two major flaws of Wikipedia.

what are the excerpts?

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