The phrase "for its sustenance" is correct and can be used in written English.
It is typically used to refer to something's need for nourishment or maintenance in order to survive or continue functioning properly. Example: The small village depended on the nearby river for its sustenance, using it for fishing, farming, and drinking water.
But the industry is already moving to a period of somewhat less dependence on DNA patents for its sustenance.
Safety is now almost as big an industry as defence, and as dependent on irrationality for its sustenance.
Enterprises serve a purpose that is largely the reason as well as the result of its existence in a form that is most amenable for its sustenance.
Even a simple plant generates free time in itself, since it does not necessarily have to devote all its time to absorbing the light, water, and other forms of nourishment that are needed for its sustenance.
"Without a doubt, this was extremely important for New Orleans, important for its sustenance," said Melanie Ehrlich, a founder of a relentlessly critical activist group, the Citizens Road Home Action Team, and herself a Gentilly resident.
Moreover, a high population density in an agrarian society, dependent upon agriculture for its sustenance, is likely to be a severer constraint upon human welfare than would the same density in a highly industrialized society, in which the bulk of national product is not of agricultural origin.
The pro-ams are the bloodline of the tour, the primary source of sustenance for its sponsors.
A mosaic of microenvironments including seacoasts, tidewaters, rivers, lakes, redwood forests, valleys, deserts, and mountains provided ample sustenance for its many residents and made California one of the most densely populated culture areas of Northern America.
We turn to it for sustenance and we embrace it for comfort.
Great beauty and tenderness accompany an account of fire devouring a house, from the first little flame "stretching its neck for sustenance like a little orange chick," to its joyous triumph, "as swelling and as rolling as the sea".
Nor did he wish to have his body sustained artificially after it had lost its capacity for self sustenance: no feeding tubes, no I.V. drips.
