Brain stem :) It controls all the things like breathing, heartbeat, body temp, blood pressure and alertness ^_^
Answer:
Option (4).
Explanation:
Denitrification may be defined as the removal of the nitrates from the environment with the help of microorganism. Denitrification is important for the maintenance of nitrogen in the environment.
Aerobic conditions refers to the conditions that has free supply of oxygen where as anaerobic condition has limited supply of oxygen. The anaerobic bacteria are living in the anaerobic condition and perform denitrification in absence of oxygen.
Thus, the answer is option (4).
Menstruation. Hope this helps!
