<span>Stranger wariness is obvious when an infant no longer smiles
at any friendly face & cries if an unaccustomed person moves too close, too
quickly. Stranger wariness appears fleetingly around 6 months of age, though it
is not always detected and at full force by 10 to 14 months.</span>
Radical criminology and peacemaking criminology
D I think because that one makes most sense
Marco Polo played an important role in creating an increased interest in global trade by 1. engaging in global trade and getting people curious about new products but mostly 2. by dictating a book of stories that would pique Europeans interest about the world outside of Europe and the products and items that could be brought back.