Which are responsibilities of public health agencies such as the Centers for Disease Control and
Prevention? Check all that apply.

Explanation:

Some common responsibilities are :

1) to protect the health of communities

2) to conduct research to improve the treatment of diseases

3) to prevent disease, illness, and injuries

4) to detect outbreaks of disease and oversee a response to them

well when looking at this if you think about it   negativley and positivley   react with each other and when the first layer gets full they add layers it starts with 2 on the first layer and it constantly goes on until the official number is there