Biology
Which organelle is the control center of a cell?

Cytoplasm
Endoplasmic reticulum
Nucleus
Cell membrane

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

A colour blind person cannot see any colours
Colour blind people learn to rely on shapes, patterns, and positions of signs and signals
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

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