10476
The water flea Ceriodaphnia dubia is among the most sensitive test species for detecting insecticide toxicity in freshwater environments . Its usefulness is limited , however , when water conductivity exceeds 2 , 000 micro S / cm ( approximately 1 ppt salinity ) and test effectiveness is insufficient .
 None
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:  
Answer:
 None