Final answer:
Modern Homo sapiens first arrived in East Asia and Australia approximately 50,000 to 70,000 years ago, after migrating out of Africa.
Step-by-step explanation:
Anatomically modern Homo sapiens made their first arrival in East Asia and Australia around 50,000 to 70,000 years ago. This migration occurred after early humans left Africa, with some groups traveling through Southeast Asia to reach these regions. The evidence of settlements in places like Papua New Guinea and Australia dates back at least forty-five thousand years, showcasing the enduring presence of humans in these areas. By about 25,000 years ago, Homo sapiens had further expanded their reach to Siberia and other parts of northern Asia.