Final answer:
Homo erectus migrated out of Africa into Asia and Europe through various proposed movements. One theory suggests migration by Homo ergaster around 1.75 million years ago, while another suggests an earlier hominin species migrated out of Africa about 2 million years ago. Homo erectus also settled on Java, likely traveling there by land during the Pleistocene Ice Age.
Step-by-step explanation:
The various suggested movements of Homo erectus out of Africa into Asia and Europe have been the subject of much debate and research. One theory proposes that Homo ergaster, a predecessor of Homo erectus, migrated out of Africa and moved northward into Eurasia around 1.75 million years ago. Another theory suggests that an earlier hominin species, possibly australopithecine or an early unknown species of Homo, migrated out of Africa about 2 million years ago and eventually evolved into the population of Dmanisi hominins, settled in eastern Europe by 1.85 million years ago. It is also known that between 1.3 and 1.6 million years ago, Homo erectus settled on Java, now part of Indonesia, likely traveling there by a land route during the Pleistocene Ice Age when seas were lower.