Final answer:
Well-dated Homo erectus fossils from Java indicate that hominins had migrated out of Africa by 1.75 mya. This species is known for its early migrations and human-like features such as larger brain size and use of fire.
Step-by-step explanation:
Well-dated Homo erectus fossils from Java tell us that hominins had migrated from Africa by 1.75 million years ago (mya). Homo erectus is known to have originated in East Africa around 1.9 million years ago and was the first hominin species to migrate out of Africa. The migration into Eurasia included regions such as India, China, and Europe. Notably, fossils found on the island of Java, now part of Indonesia, suggest that H. erectus had reached this area by a land route, which was possible due to lower sea levels during the Pleistocene Ice Age. These migrations were significant as H. erectus displayed a number of human-like features including a large brain, the use of fire, hunting capabilities, and social living structures similar to modern humans.