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Explanation:

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The shutter is the part of the camera that opens between the lens and the film/digital sensor to create photographs. The shutter is the part of the camera that allows light in. The wider the shutter is open, the more light that is let in. Less light is let in when the shutter is more closed. The varying light affects how pictures turn out. The speed of the shutter also affects the outcome of pictures.

ANSWER: A) a shutter

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