Biology
Plants are killed in winter by frost

because of desiccation and mechanical damage to the tissues
because no photosynthesis takes place at such low temperature
because respiration ceases at such low temperature
because there is no transpiration

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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
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

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