The position of which of the following indicates that a primate is bipedal?SkullJawPrehensile tailForamen magnum

Understanding Bipedalism in Primates

Bipedalism is the ability to walk on two legs, which is a key characteristic of many primates, particularly humans. When considering the anatomical features that indicate bipedalism, we can analyze each option provided:

1. Skull: While the skull is important in determining evolutionary traits, it does not directly indicate bipedalism.
2. Jaw: The structure of the jaw is related to diet and feeding habits, not to locomotion.
3. Prehensile Tail: This feature is more common in species that are arboreal (tree-dwelling) and does not indicate bipedal movement.
4. Foramen Magnum: This is the large opening at the base of the skull through which the spinal cord passes. Its position is crucial; in bipedal organisms, the foramen magnum is positioned more forward under the skull, allowing for an upright posture.

Final Answer

The position of the foramen magnum indicates that a primate is bipedal.