Each works within evolutionary necessity, deploying great flat receptor planes.

Though we cannot perfect the endeavour we should strive for it: the will-to-live constantly renews itself, for it is both an evolutionary necessity and a spiritual phenomenon.

"Their very nature-" "It was a hard thing for human beings to deal with, when we first realized how much of our behavior arose from evolutionary necessity," said Wiggin.

It is suggested that human awareness of painful stimuli is an evolutionary necessity to avoid injury and death.

Mr. Schwartz treats such developments as a kind of evolutionary necessity.

The source of the pleasure may have come about because of the evolutionary necessity to give organisms an incentive to uncover objects, such as predators, from noisy environments.

One of the things I found most compelling about the movie "Privileged Planet" is its argument that our ability to discern the design of the universe cannot be explained by evolutionary necessity.

In short, the intelligence of insects, like that of our species, seems to be more than anything else the intelligence of evolutionary necessity.

Is it an evolutionary necessity or a lucky accident that's on its way out?

This diversity is explained by the evolutionary necessity of possessing variants that slightly differ in their temporal and spatial expression.