What do these letters reveal about why people fought in the Crusades?

What is the social order of the ancient river valley civilization of mesopotamia?

Which bronfenbrenner level examines the developmental influences of homes, caregivers, friends, and teachers?

Drugs have a high potential for abuse. there is no routine therapeutic use for these drugs and they are not available for regular use. they may be obtained for “investigational use only” by applying to the u. s. drug enforcement agency. examples include heroin and lsd. which scheduled drug is this?