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Animals inhabiting cryptic environments are often subjected to morphological stasis due to the lack of obvious agents driving selection , and hence chemical cues may be important drivers of sexual selection and individual recognition .
 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