SATE :

A． brains that use less overall body energy than the percentage humans use
B． the posession of less total body weight than the average human weight
C． a total resting energy equal to that of human resting energy
D． a diet completely devoid of rich foods preferred by more developed species
E． a higher ratio of brain weight to body weight

A． demonstrate the increase of the availability of grazing mammals during the desiccation of the African landscape
B． suggest a reason why robust proto-humans eventually failed in the competition with Homo for animal prey
C． provide proof that environmental changes did indeed occur around a time of rapid evolution for Homo
D． explain the means by which Homo was able to make use of the appearance of the antelope and gazelle
E． offer evidence that with the desiccation of the African landscape, Homo's diet changed from that of the australopithecine