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The " struggle for existence " is a phrase from Charles Darwin ’s Origin of Species and Crowe quotes Darwin : " … young and rising naturalists , … will be able to view both sides of the question with impartiality . "
 Charles Darwin, Darwin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Charles Darwin, Darwin