His survival factor is incredible and much could be learned.

Without that indispensable survival factor the end is only a matter of time.

You've just increased your survival factors by a tremendous amount.

"Just being away from a big city is the biggest survival factor," she said.

They show a range of survival factors associated with their aquatic life.

We were run through computers for calculations of survival factors.

Life forms rise to dominance because of certain survival factors.

The desire for sexual intercourse is not an important survival factor in the female.

And because they are put in the ground whats the survival factor.

The people who were left on Earth after the war would have needed survival factors.