ocr: Brain space Even the clever chimpanzee (right) seems small- brained next to: a modern human (below right) in these images from: a University of Zurich exhibit. The head of: a baby chimp passes easily through the birth canal (diagram, below). In contrast, tremendous force is required to move: a human infant'si large head through its mother's narrow pelvis. Scientists speculate that A. afarensis females, such as Lucy, shared both conditions: They gave birth to small- headed infants, but the birth process was: still difficult, because their pelvises were narrowed for upright posture. AFTE ROPCAT ...
