Which of the Following Was a Key Obstacle That Hominins

question 15

Multiple Choice

Which of the following was a key obstacle that hominins' increase in brain size had to overcome?

• A) larger skulls demanding more elastic birth canals, even though the requirements of skeletal development during a woman's lifetime limit the elasticity of birth canals
• B) the challenges of walking with a head that is too heavy
• C) overcoming the trend of clumsy locomotion that makes hominins vulnerable to predators
• D) overcoming the trend of ever more self-sufficient children eager to separate themselves from their mothers
• E) larger skulls demanding larger birth canals, even though the requirements of upright bipedalism impose limits on the expansion of the human pelvic opening

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