Biology
The kidneys are stimulated to produce renin

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

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Biology
A genus can best be defined as

A taxon composed of families
The most specific taxon
A taxon comprised of classes
A taxon composed of one or more species and a classification level lying below family

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