Final answer:
The key elements of creating effective advertising are content and design.
Step-by-step explanation:
The two key elements of creating effective advertising are content and design. Content refers to the words, images, and messages that are used in the advertising. It includes the information or persuasive elements that are intended to communicate with the target audience. Design, on the other hand, involves the visual and aesthetic aspects of the advertisement such as layout, colors, typography, and graphics.
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