Light receptors which help us to see best at night are the __________
A) foveae
B) cones
C) shafts
D) rods
Answer: D
Rationale: Rods are photoreceptors that occupy peripheral regions of the retina, and are highly sensitive under low light levels. We do not see color at night or in darkness because rods do not detect color and they are more active under low light levels than cones.
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