Final answer:
The Aboriginal ancestors migrated to Australia from Asia, part of the human diaspora that began in Africa and spread across the globe.
Step-by-step explanation:
The ancestors of the Aboriginal people are believed to have migrated to Australia from Asia. They crossed over Southeast Asia more than 40,000 years ago and became the indigenous inhabitants of the Australian continent. This migration is part of the broader human movement out of Africa, where early humans first emerged and then spread out to populate different parts of the globe. Aboriginal people have adapted to and shaped the physical geography of Australia for tens of thousands of years before European colonization led to a significant decline in their numbers.