Productivity numbers have remained strong, providing a source of reassurance that the economy remains healthy.
The state keeps taking over factories, providing a source of spoils for politicians.
Mitochondria are also present, providing a source of energy in the form of ATP.
Demographic changes mean India's appetite for higher education is expanding quickly and providing a source of international postgrad students that the US is exploiting.
The research highlights how the majority of large animals are killed for meat, providing a source of food for as many as one billion people.
It was the biggest annual gain in nearly seven years, and a further sign that the strengthening housing recovery is providing a source of support for the economy.
But over the long run, the purchase of Dow Jones and The Journal is seen as providing a source of material, credibility and personnel for the Fox Business Network.
More than 150 VSLAs have been established in Katine and, based directly on the success of this approach, are being expanded to a further 11 nations globally, providing a source of capital, security and income that would otherwise be unavailable.
In Australia, a daily "penguin parade" of what can be hundreds or thousands of birds known as little penguins regularly draws paying tourists providing a source of income that has financed much research on managing the population.
The transformation of great swaths of rainforest to monoculture farming is also a mixed blessing for local populations, providing a source of low-wage employment but often displacing indigenous peoples and disrupting established livelihoods.
And the process has an added advantage since the resulting methane-heavy coffee mixture can be burnt to produce electricity, providing a source of energy that is cleaner than other fossil fuels, the scientists claim.
