Question Detail
Question
Which human structural adaptation enables energy-efficient movement, frees the hands for tool use, AND assists heat regulation?
Correct Answer
Option B is the correct answer.
Detailed Explanation
Bipedalism (walking on two legs) is a key human structural adaptation. It enables energy-efficient locomotion, frees the hands for tool use and carrying objects, and assists heat regulation by reducing direct solar exposure and promoting convective cooling.
Hint
This upright posture distinguishes humans from most other primates.