Final answer:
Homo erectus had a pelvis that flared out more than that of modern humans. This distinction allowed them to be efficient in bipedal walking while conceding some differences in anatomical structure.
Step-by-step explanation:
The question pertains to the anatomical differences between Homo erectus and modern humans. Homo erectus had tall narrow waists and completely modern feet but their pelvises flared out more than ours. This species was well-adapted for upright walking, as indicated by their long legs, narrower waist, and humanlike feet. There has been a clear evolutionary pathway visible from early hominins to Homo erectus, which includes changes in brain size, dietary adaptations, the ability for bipedal locomotion, and the use of tools. Despite these similarities, the Homo erectus pelvis was broader which allowed for efficient bipedalism while still differing somewhat from the modern human form.