The document discusses two theories about the earliest inhabitants of the Philippines:
1) Beyer's Migration Theory which claims they descended from different migrant groups from Southeast Asia over time, including "Dawnmen", Negritoes, Indonesians, and Malays.
2) Jocano's Evolution Theory which argues the earliest inhabitants evolved in situ over thousands of years from shared ancestors across Southeast Asia, rather than migrating from elsewhere like the Malay Peninsula. Archaeological evidence from Tabon Cave supports early human presence over 20,000 years ago.