Which type of research study would best be used to determine how aggressive children are while playing at a schoolyard during recess?

All of the following have been found to be strengths of African American families EXCEPT:

A) a favorable attitude toward the elderly. B) clearly defined, stable family roles. C) strong kinship bonds. D) strong religious orientation.

Jamie walks from a bright room into a dark room. It will take about ________ minutes for her rods to fully adjust to the dark

a) 10 b) 30 c) 20 d) 40