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However , Darwin 's holistic view of nature included " dependence of one being on another " ; thus pacifists , socialists , liberal social reformers and anarchists such as Peter Kropotkin stressed the value of co-operation over struggle within a species .
 Darwin, Peter Kropotkin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Darwin, Peter Kropotkin