6576
To further examine the relationship between T and potential paternal behavior , we next drew on an intensive 8 - month study of male behavior , and found that fathers were more likely to be in close proximity to their offspring than expected by chance .
 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