Biology
Radioactivity is a phenomenon of the spontaneous emission of

protons (alpha particles)
electrons (beta particles)
gamma rays (short wave electromagnetic waves)
All of these

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

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
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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