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One of the key policies of Wikipedia is that all article content has to be '''[[WP:Verifiable|verifiable]]'''. This means that '''[[WP:Reliable sources|reliable sources]]''' must be able to support the material. All quotations, any material whose verifiability has been challenged or is likely to be challenged, and contentious material (whether negative, positive, or neutral) about [[WP:BLP|living persons]] must include an ''inline citation'' to a source that directly supports the material. This also means that Wikipedia is not the place for [[WP:OR|original work]], archival findings that have not been published, or evidence from any source that has not been published.<br />
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If you are adding new content, it is [[WP:BURDEN|your responsibility]] to add sourcing information along with it. Material provided without a source is significantly more likely to be removed from an article. Sometimes such material will be tagged first with a [[Wikipedia:Citation needed|"citation needed"]] template to give editors time to find and add sources before it is removed, but often editors will simply remove it because they question its veracity.<br />
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This tutorial will show you how to add inline citations to articles, and also briefly explain what Wikipedia considers to be a reliable source.</div>en>Evolution and evolvability