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How does price elasticity of demand vary along a straight-line downward-sloping demand curve? Why does this occur?
Rhodopsin
A light-sensitive receptor protein found in the rods of the retina, critical for vision in low-light conditions.
Photoreceptor
Sensory receptor that is sensitive to light—for example, rods and cones of the retina.
Lens Flattens
A process where the lens of the eye changes shape, becoming less curved, to focus distant objects clearly onto the retina.
Ciliary Muscles
Ring-shaped muscles located in the eye that control the shape of the lens to focus on objects at varying distances.
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