Closed meetings are not open to viewers and are for alcoholics having a serious desire to completely stop drinking. These meetings are for alcoholics Anonymous members only, consisting of men and women who share their experience, hope and strength with each other that they may solve their common problem and help others to recover from alcoholism. Therefore, the requirement is the desire to stop drinking.
Fairly sure that would be secondary succession.
Answer:
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White Blood cells Because they are produced in your body and they are constantly used more than they are replaced