Is it that the communication of joy has no survival value for us, while the communication of distress has?
The survival value of the slight gains in size and strength from millennium to millennium could have played no part.
In other words, education must prove to be of survival value.
Looked at from the standpoint of natural selection, this would come about as a mere matter of survival value.
For instance, she is concerned with color and form only so far as they have survival value.
There may be several different criteria of survival value, not comparable in any quantitative way among themselves.
Things always prove their survival value, that is to say the real things last, while the shams are sooner or later extinguished.
The maintenance of a home range is of survival value to the cottontail.
It has a high 'survival value' in the struggle for existence by heightening individual power in conflict.
survival value indeed, as applied to men in groups, is not a very clear concept.