Biology
Excretion is best described as the removal of

Water molecules from dipeptide hydrolysis
Toxic wastes by the process of cyclosis
Metabolic wastes from a cell
Undigested material from the digestive tract

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Biology
The kidneys are stimulated to produce renin

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

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