In biology, adaptation haes three relatit meanins. Firstly, it is the dynamic evolutionar process that fits organisms tae thair environment, enhancin thair evolutionar fitness. Seicontly, it is a state reached bi the population in that process. Thirdly, it is a phenoteepic or adaptive trait, wi a functional role in ilk individual organism, that is maintained an haes been evolved bi naitural selection.