Assertion: bacteria's number | /r/CreatedBy | strong selection
Facets:
value: for reduced aggression
type: PURPOSE
Source sentences:
text: The earliest sign of domestication in dogs was the neotonization of skull morphology and the shortening of snout length that results in tooth crowding, reduction in tooth size, and a reduction in the number of teeth, which has been attributed to the strong selection for reduced aggression.