Making words appear is an animation feature. Here is a tutorial on animation in powerpoint:
http://www.findpowerpoint.com/tag/animation/
You can use the various styles and layouts. These can make your presentation look pretty.
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how can i make a presentation on advertisement?
The easiest way to do a perfect presentation is to practice. The more you practice, the more you are prepared to make the presentation.
Good PowerPoint presentations are not hard to make. There needs to be a lot of pictures, and no walls of words. The presentation should not be read off of the screen, the screen should be used simply for cues on what to talk about next.
Photos or pictures make a presentation Interactive. They make it easy to understand the slide.
words that appear of subtopics
Not necessarily. If you give an oral presentation and do not use any technology, such as Microsoft Powerpoint, then it is just an oral presentation. A Powerpoint presentation is often done as part of an oral presentation, and it can make it more interesting.
You can make the presentation yourself on the electrolysis. It will make you understand the topic well.
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headings and body
yes