The adaptive radiation of the australopithecines after their split from the lineage that led to early homo seems to have focused on:

For the answer to the question above,
The adaptive radiation of the australopithecines after their split from the lineage that led to early homo seems to have focused on "Mastication"
Mastication is the first step of eating in which food is crushed and ground by the teeth

I did not understand your question properly and sorry for telling