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

Nitrobacter
Nitosomonas
Azotobacter
Azospirillum

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Biology
Which statement best describes Arteries?

They have thick walls and transport blood away from the heart
They have thick walls and transport blood toward the heart
They have thin walls and transport blood away from the heart
They have thin walls and transport blood toward the heart

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