Thus depression may be a social adaptation especially useful in motivating a variety of social partners, all at once, to help the depressive initiate major fitness-enhancing changes in their socioeconomic life.

The new theory suggests instead that proto-lungs and proto-limbs were useful adaptations to negotiate the environment in humid, wooded floodplains.

Landis's most useful adaptation, however, came in the form of an idea.

This is a particularly useful adaptation when the soil is either wet or nutrient-poor.

Natural selection has produced useful adaptations in eukaryotes.

Fire moss contains photoprotective pigments, which are a useful adaptation for the bright Antarctic environment.

This is a useful adaptation for a species whose females mate polyandrously.

-on physiological nature of useful adaptations in plants.

This is a useful adaptation of the Rules of Procedure.

This doesn't represent a useful adaptation for the species, but is excellent for harvesting and transporting corn.