According to the graph, radioactive decay is a(n) _________ in radioactivity as a function of time. 
Definitions:
Sclera
The white, outer layer of the eyeball that provides protection and shape.
Choroid
The vascular layer between the sclera and the retina in the eye, providing oxygen and nourishment to the outer layers of the retina.
Retina
The inner lining at the back of the eye that contains light-sensitive cells (rod and cone cells) which convert light into neural signals for vision.
Cornea
The transparent outer covering of the eye that helps to focus incoming light.
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