Who and How studies Helicopters?

Neo-colonial researchers study helicopters. They do things like emergency medical services, fire fighting, forestry, law enforcement, military (all branches) tourism, and more.

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both the house and senate must approve the conference report.   after it is approved by both on an identical from, it will be sent to the president.   if the president approves it, it will become law.

answer; i do believe that the answer is (c) electrolyte imbalance or (d) cessation of menstrual cycle; plz check first good luck