Discussion
The retina contains two classes of photoreceptor, namely
Answer: B
Correct answer: rods for low light vision and cones for colour vision
The duplex retina divides the work. Rods are extremely sensitive but of a single type, so they cannot signal wavelength and give no colour at low light levels. Cones need far more light but come in three types, and comparing their responses is what makes colour vision possible.
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