whAt DoEs thE pAssAgE mAinly DisCuss
A．thE DiFFErEnCE BEtwEEn psyChology AnD physiology.
B．thE DiFFErEnCE BEtwEEn humAn AnD AnimAl BEhAvior.
C．how FEAr woulD BE ExplAinED By An psyChologist .
D．how sCiEntists DiFFEr in thEir ApproAChEs to ExplAin things.