Researchers Who Have Studied Colour Blindness and Colour Deficiency Have

Researchers who have studied colour blindness and colour deficiency have found that:

A) total colour blindness is extremely rare in animal species.
B) total colour blindness in humans usually occurs when cones of the retina are absent or malfunctional.
C) blue-yellow colour blindness is the most common form of colour deficiency.
D) colour deficiency is more frequently found in women than in men.

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