What is the definitions of vanished

One common educational practice is to chart students' progress over time so that students can see their own improvement. these progress charts often lead to higher student achievement in the absence of other observable forms of reinforcement. the effectiveness of such charts in changing behavior illustrates the role of reinforcement as:

Consultant: you're welcome. as a first step, our team analyzed the other potential primary contenders. the reality is that with such a strong field, it is going to be difficult to gain the of votes necessary to avoid a runoff—unless you want to go negative from the start. and our opposition research team found plenty of ammunition to do just that.

Who was put in the concentration camps? and why