Biology
Which of the following is not true of colour blindness?

A colour blind person cannot see any colours
For some people, it might be difficult to recognize colours of traffic lights and signs
Red-green colour blindness is the most common type of colour blindness
Colour blind people learn to rely on shapes, patterns, and positions of signs and signals

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Biology
Which one among the following statements is correct ?

All arteries carry oxygenated blood
Except the pulmonary artery, all other arteries carry oxygenated blood
Except the pulmonary vein, all other veins carry oxygenated blood
All veins carry oxygenated blood

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