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.
Cuttlebone is composed primarily of aragonite. It is a chambered, gas-filled shell used for buoyancy control; its siphuncle is highly modified and is on the ventral side of the shell. The microscopic structure of cuttlebone consists of narrow layers connected by numerous upright pillars.