| Our data suggest that the performance paradigm can be expanded to reveal more of the physiological underpinning of natural selection in the wild. |
| Drug resistance arises by natural selection, mutant strains being selected when the virus replicates in sub-limiting drug concentrations. |
| This sort of pain is just what we would expect from natural selection, which is a jerry-builder. |
| This type of altruism seems inconsistent with principles of natural selection. |
| We are now told, with equal wonder and admiration, that natural selection is the agent of exquisite design. |
| As gene frequencies change, natural selection acts on the outcome, the expression of those genes. |
