1) Several theories attempt to explain how humans first populated the world, including Creationism, the Out of Africa theory, and the Austronesian Migration theory.
2) The Out of Africa theory proposes that modern humans originated in Africa around 160,000 years ago and migrated across the globe in successive waves, populating Asia, Europe, and other regions.
3) The Austronesian Migration theory suggests a group migrated from China to Taiwan around 3500 BC, reaching the Philippines by 3000 BC and dispersing further to areas like Indonesia, Polynesia, and Madagascar in subsequent centuries.