Final answer:
Ardipithecus ramidus exhibits characteristics of both bipedalism and adaptations for arboreal locomotion. The forward position of the foramen magnum suggests that Ardipithecus was bipedal, and the shape of its pelvis indicates a human-like bipedal gait.
Step-by-step explanation:
Ardipithecus ramidus, an early hominin species, exhibits characteristics of both bipedalism and adaptations for arboreal locomotion. The forward position of the foramen magnum suggests that Ardipithecus was bipedal, and the shape of its pelvis indicates a human-like bipedal gait. On the other hand, the presence of an opposable big toe and the finding of fossil bones in forested environments suggest adaptations for climbing and quadrupedal movement in trees.