3494
Both gradients covered a broad range of Zn and Cd concentrations in the humus layer ( 109 - 6151 and 1 . 48 - 71 . 4 mg kg ( - 1 ) , respectively ) and body metal concentrations increased with increasing soil metal concentrations .
 Chemical: Zn; Chemical: Cd
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: Zn; Chemical: Cd