Final answer:
Along with Homo ergaster/erectus, various species from the Australopithecus lineage adapted to life on the savannah, supporting the savanna hypothesis of evolution.
Step-by-step explanation:
In addition to Homo ergaster/erectus, the Australopithecus lineage, including various species such as Australopithecus afarensis and others, adapted to life on the savannah. These early hominins were bipedal and exhibited traits that were beneficial for a savannah habitat, such as humanlike feet with arches that supported bipedal walking. The shift to a savannah environment is linked to the savanna hypothesis, which suggests that many human traits, including upright bipedalism, evolved as adaptations to living in this type of habitat.