4221
The snails were fed venerid clams Ruditapes philippinarum , mussels Perna viridis , oysters Crassostrea angulata or barnacles Fistulobalanus albicostatus , each differing greatly in their metal accumulation and handling patterns .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None