3496
The significant increase in the whole - organism respiration rate with the body metal concentration was found when taking into account other factors such as body mass , gradient ( or year of sampling as the beetles were collected on the gradients in different years ) and the interactions : body metal concentrations x collection date , body metal concentrations x body mass , and body mass x gradient / sampling year .
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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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