Final answer:
Ardipithecus kadabba was discovered in the late 1990s and is dated to about 5.6 MYA, being one of the early species of hominids that provides insights into the evolution of bipedalism.
Step-by-step explanation:
Ardipithecus kadabba, one of the earliest hominids, was discovered in the late 1990s. Specimens of A. kadabba are older than those of A. ramidus, with the former dating to about 5.6 million years ago (MYA). These discoveries, particularly of Ardipithecus, have added crucial information to our understanding of early human evolution and bipedalism.
The bipedal nature of Ardipithecus kadabba was confirmed through the study of additional specimens found after the initial discovery. The characteristics of Ardipithecus, such as reduced canine size and an opposable big toe, suggest a creature that was likely bipedal on the ground but still capable of climbing trees. The discovery of Ardipithecus kadabba plays a significant role in the ongoing research and debate regarding human ancestry and the development of bipedal locomotion.