I believe the answer is: cline In biological term, cline refers to forms of species that might display various genetic different even though they live in a similar geographical features. The difference is most likely resulted from changes in allele frequencies that manifested over time.
From an anthropologist's point of view, the concept of human diversity is inappropriately attributed to race, while Cline is the right concept to classify them.
Explanation:
First of all, from an anthropologist's perspective, the concept of different human races is just incorrect because characteristic variances don't specifically distinguish one human race from another. In this perspective, there is only one human race because we don't have significant differences to distinguish one trait from the other. So, the concept of "cline" is better to classify different human characteristics.
