Johann blumenbach published a typology of humanity that divided humans into five groups that correspond to different geographical areas—caucasians, mongolians, ethiopians, americans, and malays. why was his research fundamentally flawed?

His research fundamentally flawed Because of the reasons mentioned below:

Johann Friedrich Blumenbach  was a German physiologist, anthropologist and physician. He was the first person to explore the study of the human being and categorize them as an aspect of natural history. He studied skull morphology. He categorized humans species and gave basic equality to all races and people. His theories were flawed as it showed the variations that exist in the human form. He also presented that there is no differences between human species. His thinking with respect to categorization is so different.