Exposures to odors in natural environments often occur over far longer periods, and the resulting adaptations may differ qualitatively from short-term olfactory adaptation.
Over the past century and a half, however, studies in the history of human development have shown that the formation of culture is part of the biological adaptation.
然而，在过去的一个半世纪里，对人类发展史的研究表明，文化的形成是生物适应的一部分。
3
All such entities need nurturing and adaptation to changing circumstances over time.