Biology
Excretion is best described as the removal of

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

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Biology
Ozone hole refers to

hole in ozone layer
decrease in thickness of ozone layer in stratosphere
decrease in the ozone layer in troposphere
increase in the thickness of ozone layer in troposphere

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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 specific gravity of urine rises above 1.10
When the peritubular capillaries are dilated

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