Although the candidates are selected instead of elected, the process has to follow strict standards. 1. The candidates have to be always in the political system.
1 An example of mettle is a soldier's bravery.  An example of mettle is a person who has spirit and courage.
Methanogens are anaerobic unicellular organisms, that release methane as a waste product of cellular metabolism. All of the methanogens are lithotrophs that can make their own energy only by methanogenesis, or the production of methane.