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Parameter Tree:
EARTH SCIENCE > BIOSPHERE > VEGETATION > NUTRIENTS
Definition:
Nutrients are elements essential for growth and survival of a given organism.
 Directly or indirectly, nutrients have roles in metabolism that no
other nutrients fulfills.  
Reference:
Starr, C. and R.Taggart. 1998. Biology: the unity and diversity of life.
Wadsworth Publishing Company. Belmont, California.
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