Biology
The branch of botany which deals with identification, nomenclature and classification of an organism is known as

Morphology
Paleobotany
Taxonomy
Phytochemistry

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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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