Biology
It is composed of two polynucleotide chains which are coiled round each other in the form of a double helix.

None of these
Fats
DNA
RNA

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Biology
The kidneys are stimulated to produce renin

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

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