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essay question
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essential
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essential element
es·sen·tial el·e·ment (plural es·sen·tial el·e·ments)


noun 
Definition:
 
element necessary to body: a chemical element that is necessary to the healthy growth of an organism
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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