Could you please clarify what you mean by "Hilly Flanks Hypothesis"?
Perhaps you're thinking of:
* The "Out of Africa" theory: This theory suggests that modern humans originated in Africa and then migrated to other parts of the world. The geographic features of Africa, including hilly flanks, are believed to have played a role in human evolution.
* The "Savannah Hypothesis": This hypothesis suggests that the development of the African savanna influenced the evolution of early hominids. It's possible that the hilly flanks of the savanna provided a suitable environment for early humans to thrive.
Please provide more context or details about what you're looking for, and I'll be happy to help!
