Final answer:
The simplest hypothesis is that all the hominins found are all members of the genus Homo. Hominins are species in direct lineage to humans and share bipedal locomotion.
Step-by-step explanation:
The simplest hypothesis is that all the hominins found are all members of the genus Homo. The term hominin refers to all species considered to be in direct lineage to humans, including Homo sapiens, as well as other extinct human species such as Homo habilis and Homo erectus. These hominins share the anatomical behavioral complex of bipedal locomotion, which distinguishes them from other hominoids like gorillas and chimpanzees.