25631
We detected significant and dose - dependent responses on population traits , such as changes in abundance for several populations , increased average size and fluorescence of cells , and strong changes in within - population trait mean and variance ( suggesting micro - evolutionary effects ) .
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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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