Biology
Alveoli is related to which of the following system of human body?

Reproductive system
Excretory system
Respiratory system
Circulatory system

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

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

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