For one to be diagnosed as bulimic, he or she must average binge(s) per week for at least three months.

2

A binge means eating to more than full in a  short matter of time.  Binge eating disorder is a life-threatening, but treatable eating disorder characterized by binges or eating large quantities of food in a quick manner to the point of discomfort. If an individual is averaging 2 binges per week for at least three months, he can be considered as bulimic.  

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

which

what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements