survival value

Is it that the communication of joy has no survival value for us, while the communication of distress has?

Having once originated, the sexual type of reproduction possessed a definite survival value which assured its continuation.

Complete telepathic blankness would have a high survival value.

Things always prove their survival value, that is to say the real things last, while the shams are sooner or later extinguished.

Survival value indeed, as applied to men in groups, is not a very clear concept.

There may be several different criteria of survival value, not comparable in any quantitative way among themselves.