Final answer:
The first definite hominids belong to the genus Ardipithecus. Ardipithecus is a genus of early hominids that lived approximately 4.4 to 5.6 million years ago and were bipedal.
Step-by-step explanation:
The first definite hominids belong to the genus Ardipithecus. Ardipithecus is a genus of early hominids that lived approximately 4.4 to 5.6 million years ago. Fossil evidence shows that Ardipithecus was bipedal, which means they walked on two feet. They are considered to be one of the earliest hominid species.