Biology
Homeostasis is the condition in which the body maintains

A static state with no deviation from preset points
The lowest possible energy usage
A relatively stable internal environment within limits
A changing state within an unlimited range

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Biology
The kidneys are stimulated to produce renin

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

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