how have public service campaigns changed over time? advertisers have integrated new media and technologies. sponsors have begun to sell access tothe media that are used. the goverment has begun to sponsor public service announcements. researchers have learned to use new types of appeals and arguments.

What sisters? is it in a story?

Afirefighter is a rescuer extensively trained in firefighting, primarily to extinguish hazardous fires that threaten life, property and the environment as well as to rescue people and animals from dangerous situations.  just cut some parts to make them shorter and add some of your facts or what describes them most. or what they are supposed to do.