Friedrich Blumenbach categorized humans into the following races:
a. Negroids, Caucasoids, and Mongoloids.
b. Mongoloids, Negroids, Inuit, and Caucasoids.
c. Mongoloids, Malays, Ethiopians, American Indians, and Caucasoids.
d. Mongoloids, Negroids, Malays, Europeans, and Caucasoids.
Availability of food:
a. is dependent upon kin selection.
b. can be highly variable, depending on season and rainfall.
c. is determined by the alpha male only.
d. is restricted to individuals in the dominant hierarchy.
The Nariokotome Boy discovered at Lake Turkana (Homo erectus) has modern human