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He had a profound impact on paleontologist Charles Doolittle Walcott and natural scientist Edward S. Morse .
 Charles Doolittle Walcott, Edward S. Morse
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 Doolittle Walcott, Edward S. Morse