We need food and water in order to sustain life.

Without it, the Earth would be too cold to sustain life.

We also do not know if the conditions on earth are the only set that can sustain life.

Rural poor had no choice, but to sustain life in whatever way possible.

"At need it will sustain life with no other food."

The air became very close, barely enough to sustain life.

All the elements necessary to sustain life, but nothing else.

There is little on the Moon to sustain human life.

No one knows how many more ages it may not sustain life.

"I am now very concerned that soon she will have no means at all of sustaining life."