7968
The aim of this study was to determine the ecotoxicity of differently aged TDFs by investigating earthworm ( Eisenia andrei ) responses viz . growth , reproduction , neutral red retention times ( NRRT ) and tissue metal concentrations .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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