Natural selection also explains many basic revulsions, such as the horrid smell of rotting meat, or fears, such as the fear of snakes or standing close to the edge of a cliff.
Seleksi alam juga menjelaskan banyak perubahan dasar, seperti bau busuk menyengat dari daging busuk, atau ketakutan, seperti takut akan ular atau berdiri di dekat tepi jurang.