18560
This novel type of " hidden " synergistic interaction may have profound fitness implications , and when ignored will lead to underestimations of the impact of pollutants in natural populations where predators are omnipresent .
 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