The highest taxonomic classification into which organisms are grouped, based on fundamental similarities and common ancestry. One widely accepted taxonomic system designates five such classifications: animals, plants, fungi, prokaryotes, and protoctists.

• 界以基本特征相似和共同祖先为基础的将生物体分类的最高的分类学的分类法。一种被广泛采用的分类学系统表示为五大类别：动物、植物、真菌、原核生物，和原生生物