Usually, stranger wariness is first noticeable at months

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.

answer; i believe the correct answer is prefrontal cortex;

answer; the federal reserve system;