The justice system disappeared and traditional courts re-emerged out of necessity.
The lateral-line system disappeared, and the eyes were adapted for vision through an aerial medium.
"Once the Labour party stopped being socialist, a lot of the reason [for voters] to be loyal to the political system disappeared," says the historian Ross McKibbin.
The lawyer, Mohammad Mostafaei, 37, an outspoken critic of the Iranian judicial system, disappeared from Tehran on July 24 after questioning by the Iranian authorities, who then issued an arrest warrant for him.
In formal network analysis terms, the "relationship" between the two main actors of the system disappeared in 2012 after they realised that their main and pressing priority was the survival of their own organisations.
Then, during the following interglacial period at the beginning of the Holocene, about 10,000 years ago, this vast system disappeared almost completely as a consequence of the quick expansion of temperate forests (in Europe) and taigas (in Asia) from their ice-Age refugia [ 49].
When teenagers leave for college, that personal support system disappears.
The problem, though, is what comes next, what happens when the leader who implemented that system disappears.
I missed a week of work restoring what I could, only to have my hard drive start screeching and the operating system disappear again.
