Question

Choose the statements below that are true about the anatomy of humans that allow for bipedalism. Check all of the boxes that apply.
The foramen magnum is located in the back of the skull.



The pelvis is rotated inward.



The knees are very mobile and rotate easily.



Each foot contains only one arch that distributes weight from side to side.



The spine contains a lumbar curve.



The big toe is enlarged.

Answer 1

The answers are :

The pelvis is rotated inward

The spine contains a lumbar curve

The big toe is enlarged

Answer 2

Answer:

The correct answers are "The pelvis is rotated inward", "The spine contains a lumbar curve" and "The big toe is enlarged".

Explanation:

Bipedalism was an adaptation that had a dramatic impact through human's evolution. Multiple anatomical features made bipedalism possible, including:

- "The pelvis is rotated inward". The inwards rotation of the pelvis increase step length because the rotation gets around the long axis of the humerus and femur.

- "The spine contains a lumbar curve". The lumbar curve helps the vertebral column to not lean forward constantly, which releases muscular pressure at that zone and allows for bipedalism.

- "The big toe is enlarged". The enlargement of the big toe aids to bipedal locomotion and adds balance since it is lined up with the other toes.