We can actually deduce that these two advertisements demonstrate that public service campaigns have changed over time in the following way: The first ad relies on the print medium, while the second is interactive.
Advertisement can be seen as a way that the public is informed about products, ideas, or services so that potential customers can buy or engage them.
From both announcements, we realize that they show how the campaigns of the public service over time had changed. We see it as the first ad relies on print medium and the second ad is actually interactive.
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