3690
In an effort to identify new strategies for resolving what has been characterized as a " taxonomic and nomenclatural nightmare " , we employed five different approaches for delimiting species in a group of closely related tarantulas from the Mojave Desert in the southwestern United States .
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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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