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As the structural basis for life , one of carbon 's important features is that unlike silicon , it can readily engage in the formation of chemical bonds with many other atoms , thereby allowing for the chemical versatility required to conduct the reactions of biological metabolism and propagation .
 carbon
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 carbon