Final answer:
The fossils of 'Ardi', 'Lucy', and Nariokotome boy are crucial for understanding early human evolution and the transition to bipedalism, providing insights into the anatomy and development of early hominin species.
Step-by-step explanation:
The fossils of "Ardi", "Lucy", and Nariokotome/Turkana boy are important because they provide significant evidence of early human evolution and the transition from quadrupedal locomotion to bipedalism. Ardipithecus ramidus, commonly known as Ardi, dated to the Pliocene Era, offers insights into the very early stages of hominin evolution. Australopithecus afarensis, with the famous specimen called Lucy, represents one of the best-studied early hominins and shows clear adaptations to bipedal walking. Lastly, the Nariokotome boy or Turkana boy is one of the most complete skeletons of a pre-modern human, providing invaluable information on growth patterns and the developmental biology of early Homo.