What were the important developments that occurred in photography that facilitated the creation of motion pictures? Two critical developments in photography that enabled the development of motion pictures were___and___​

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Explanation:

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"A moving picture is an illusion that makes a still photo seem to move. The basic principal behind motion pictures is the fast transition between one picture to the next, almost creating a seamless transition. A flip-book is a good example of this. Another example would be film used for old movies. The film contains negatives of an image which when light is shined through creates a "shadow" of the image. If you quickly transition the film from one image to the next you end up a motion picture."

Explanation:

i think the answer is b.

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