Including a "dead" variable is important as it is a vital link in the food chain.
BBC: The model should aid future management of the North Sea
"Trains are a vital link in the accessible transport chain, " said transport minister Charlotte Atkins.
Mr Markelov had been a vital link between anti-fascist activists, such as Ms Baburova, and the police.
Westward, Russia has regained much of its lost influence in Ukraine, a vital link in gas transit to European markets.
FORBES: Putin Isn't "Gaining Ground" Regardless of what Amir Taheri Says
They are a vital link for remote bases, carrying workers and supplies and are mostly contracted from Russian companies, our correspondent adds.
This not only regulated activity in a tightly planned economy, but was also a vital link in the chain of social control.
The planes are also equipped with HF radios and satellite phones which provide a vital link back to the operations staff at Northolt.
For those unaware of the Upper Peninsula in Michigan, the Soo is one of the largest cities in the UP and it provides a vital link to Canada.
FORBES: Soo Bridge Celebrates 50 Years, Ambassador Bridge Fights, and the Mighty Mac Separates
And Hancock and his descendants served as a constant source of conversation between my father and me, a vital link between us when, class-wise, and in every other wise, each year placed us farther apart.
"The Forth Road Bridge has provided 25 million vehicles every year with a connection between communities north and south of the Forth estuary whilst acting as a vital link in Scotland's transport network, " he said.
To dispatchers in Lower Manhattan, that is the most obvious sign that all is still not well with PATH, a vital link for New Jersey commuters that still isn't back to full operation nearly three months after superstorm Sandy.
"A graduate tax is a bad idea that would break the vital link between a student's fees and the institution, " says the 1994 Group of universities.
And supporters say the high speed link is a vital part of the regeneration of east London, with the leading executives of 82 of London's largest companies promising they would accept a one-off supplementary business rate to fund the rail link.
BBC: NEWS | UK | England | London | On track for Olympic bid?
Mikey Tomkins, London Food Link, said bees should be protected because they are a vital part of our ecosystem.
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