2443
Overall , the results are in accordance with environmental parameters , such as distance to pollution sources , sediment type and hydrodynamics , and show that the combination of multiple histopathological features in these clams provides good sensitivity for inter - site distinction even when low or moderate anthropogenic impacts are at stake .
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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:
 None