Researchers studying chimpanzees in the wild report that they have found at least 39 customs that are specific to local chimpanzee groups. These differences in tool use, grooming, and courtship rituals can be accounted for by:

Answer: Cultural diversity

Explanation: The existence of differences or distinct customs, behavior, attitude within a certain group, society or community is referred to as cultural diversity. One may expect that chimpanzees should all have the same attribute, custom usually called monoculture, However, this is not usually the case, differences may exist within a group even though they possess similar physical build or outlook. Differences in greeting, religious ritual, cultural sentiment, grooming and so on make up differences between groups within a society, which is reffered to as diversity in culture.