Conducting a fair test is one of the most important ingredients of doing good, scientifically valuable experiments. To insure that your experiment is a fair test, you must change only one factor at a time while keeping all other conditions the same. Scientists call the changing factors in an experiment variables.
Eligibility Requirements for VFW Auxiliary Membership: Members must be citizens of the United States or a United States National, and at least 16 years old.
Marine Option NROTC Eligibility. General eligibility requirements for the program are as follows: 1  Be a U. S. citizen. 2  Be 17 years of age by September 1st of the year starting college and less than 23 years of age on June 30th of that year.