Biology
The main function of the inner bark of a woody plant is to

Transport food from the leaves to the other parts of the plant
Protect the plant from herbivorous animals
Act as a membrane impermeable to water and gas
Transport minerals and water from the roots to the leaves

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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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