theme: the main subject of something such as a book, speech, art exhibit, or discussion It seems to me that your teacher has already provided the theme (main subject) of your power point presentation: the functions of organs. You should be OK if you present your findings in a uniform way, using the same kinds of diagrams, charts, and pictures for each organ you discuss. The effect to strive for is not to have any "bumps" in your presentation — things like suddenly showing a picture in a garish color not seen in any of your other pictures, or suddenly showing a picture that has very small writing on it compared to the writing on all the other pictures you show.
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theme: the main subject of something such as a book, speech, art exhibit, or discussion
It seems to me that your teacher has already provided the theme (main subject) of your power point presentation: the functions of organs.
You should be OK if you present your findings in a uniform way, using the same kinds of diagrams, charts, and pictures for each organ you discuss. Th