[Campbell Biology P.798] Which of the following statements accurately describes a key indica... | Practice Question

Which of the following statements accurately describes a key indicator of bipedalism found in early hominins, as mentioned in the text?

  • A: The foramen magnum was located relatively far back on the skull, similar to chimpanzees.
  • B: Early hominins had significantly larger brains compared to modern humans, facilitating upright posture.
  • C: The foramen magnum was located underneath the skull, allowing the head to be held directly over the body.
  • D: The reduction in canine teeth was the sole indicator of bipedalism in early hominins.

Explanation

The text states: 'One clue to their upright stance can be found in the foramen magnum, the hole at the base of the skull through which the spinal cord passes. In chimpanzees, the foramen magnum is relatively far back on the skull, while in early hominins and in humans , it is located underneath the skull. This position allows us to hold our head directly over our body, as early hominins apparently did as well.'