Final answer:
Homo erectus migration out of Africa was made possible by factors such as climate change, the desire to follow prey, and the availability of land routes during the Pleistocene Ice Age.
Step-by-step explanation:
Homo erectus migration out of Africa was made possible by several contributing factors. One factor was climate change, as the drier conditions in Africa made it more difficult for early humans to find plants and animals for survival. As a result, they were motivated to explore new areas in search of resources.
Another factor was the desire to follow prey. Homo erectus likely stayed close to rivers and lakes during migration, hunting and eating animals like rhinoceroses, bears, pigs, and crocodiles. They moved to different environmental conditions and evolved over time to adapt to these new areas.
Furthermore, the availability of land routes during the Pleistocene Ice Age allowed for the migration of Homo erectus to other regions. The lower sea levels provided more passage through interior coastal routes, facilitating their movement to places like Java, which is now part of Indonesia.