Which is true for colour vision? a. Rods and cones are needed to discriminate wavelength.b. Only one cone class is needed to discriminate wavelength because each cone class is sensitive to a wide range of wavelengths.c. At least two cone classes are needed to discriminate wavelength.d. At least three cone classes are needed to discriminate wavelength.e. The number of cone classes that an organism possesses indicates the number of different wavelengths that it can discriminate.

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