Biology
Our skin, when exposed to excess sunlight, becomes dark. This is because our skin pigments called

Xanthophyll
carotene
flavoxanthin
melanin

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Biology
The kidneys are stimulated to produce renin

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

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