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These results show that the chemical composition of the pore water does affect bioavailability of copper in soil , but that copper uptake in collembolans is dominated by homeostatic regulation rather than by soil properties like pH .
 Chemical: copper; Chemical: copper
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: copper; Chemical: copper