Question

why was celluloid crucial to the development of motion pictures? it was flexible and durable enough for thousands of images it was a cheaper alternative to paper it could record sound it was the worlds first colored film

Explanation:

Celluloid is a type of plastic. In the context of motion pictures, it was used as the base material for film strips. For motion pictures, thousands of images (frames) need to be strung together. Celluloid's flexibility (it can be wound on reels) and durability (it can withstand the mechanical stress of being run through projectors and cameras repeatedly) were essential. Paper is not durable enough for this mechanical use in motion - picture equipment. Celluloid itself does not record sound (sound recording on film came later with different technologies like optical sound recording). Also, celluloid was not the first - colored film; there were early experiments with hand - coloring on other materials before celluloid became widely used for motion - picture film.

Answer:

It was flexible and durable enough for thousands of images.