Biology
The kidneys are stimulated to produce renin

By a decrease in the blood pressure
When the peritubular capillaries are dilated
When the pH of the urine decreases
When the specific gravity of urine rises above 1.10

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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
A colour blind person cannot see any colours
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

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