12441
In the present study , three populations of the terrestrial isopod Porcellionides sexfasciatus , collected at an abandoned mine area , were compared to assess the effects of metal contamination on tolerance to lethal and sublethal levels of copper , through comparison of survival , avoidance , and feeding .
 Chemical: copper
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: copper 
Answer:
 Chemical: copper