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The image compares skeletal systems of Australopithecus afarensis (walker & tree climber) and Homo erectus (walker & endurance runner). Australopithecus afarensis features: unbalanced head (long snout), high/narrow shoulders, wide chest, short/wide waist, long forearm, small gluteus maximus (not shown), long femoral neck, small hip/knee/ankle joints, short achilles tendon, small heel bone, long toes, partial foot arch. Homo erectus features: balanced head (short snout), low/wide shoulders, narrow chest, tall/narrow waist, short forearm, big gluteus maximus (not shown), short femoral neck, large hip/knee/ankle joints, long achilles tendon, enlarged heel bone, short toes, stabilized foot arch.
Given the complexity of the image, the above description may not be entirely accurate.
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The given diagram demonstrates the structure of distinct skeletal systems of two human ancestors.
Overall, the climber and the runner have differences compared to each other, with the former generally having larger body parts, while the latter’s body parts being more balanced.
Regarding the head, while the australopithecus afarensis has a longer snout, a more balanced head, lower and wider shoulder are portrayed on homo erectus.
In the upper part of these skeletons, the climber possesses a wider chest, the runner shows a shorter and narrower waist with bigger gluteus maximus, which is not shown. However, a shorter forearm and femoral neck are found on the homo erectus but not the climber one.
As for the latter part, most parts in the skeleton on the right are larger or longer than that on the left. While the runner one has larger hip, knee and ankle points with longer achilles tendon, the climber one possesses a smaller heel bone, longer toes and more partial foot arch.
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