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By the 1900 s , chemists had begun to recognize that many of the natural resins and fibers were polymeric , a term introduced in 1833 by Jöns Jacob Berzelius .
 Jöns Jacob Berzelius
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Jöns Jacob Berzelius