Biology
Which of the following is true about veins?

Veins have valves; arteries do not
Veins are more muscular than arteries
Veins carry blood away from the heart, while arteries carry blood to the heart
Veins have a smaller diameter lumen than arteries

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

Colour blind people learn to rely on shapes, patterns, and positions of signs and signals
Red-green colour blindness is the most common type 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

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