Developing structures generally are most vulnerable to damage from environmental factors during the stage of prenatal development.

Developing structures generally are most vulnerable to damage from environmental factors during the _EMBRYONIC__ stage of prenatal development.

This stage of prenatal development lasts from about week two until about week eight.

what is the question?

i believe the answer is: description

description refers to the goal of psychologist to identify the phenomenon that being observed. this goal is being actualized by collecting data/information from various clues that observed through the phenomenon. this goal must be accomplished before pyschologist able to create methods of treatment.