Biology
In N2- fixation process, nitrite is converted to nitrate by

Azospirillum
Azotobacter
Nitrobacter
Nitosomonas

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Biology
The kidneys are stimulated to produce renin

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

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