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An outer layer of [[cell|cells]] designed to provide protection.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref>
An outer layer of [[cell|cells]] designed to provide protection.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref> Also known as the top layer of skin.
==References==
==References==
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[[Category:Biology]]
[[Category:Anatomy]]