21035
With their near global distribution , and as most field biologists know , irritatingly high frequency in most terrestrial areas of conservation concern ( which directly translates into ease of sampling them ) , the authors present extremely encouraging results that indicate how carnivorous flies may soon represent a strong weapon in the conservation arsenal .
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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:
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