Question

Using the pelvis, what evidence do we have of bipedal motion? Select what you believe to be 2 pieces of this evidence*

A) Wider pelvis
B) Angled Femur
C) Short
D) Three feet were originally given to people.

Answer 1

Evidence of bipedal motion is found in the angled femur and wider pelvis, which are adaptations for upright walking. The Laetoli footprints further support this evidence with a preserved striding gait of early human ancestors.

Step-by-step explanation:

The question asks us to identify evidence from the pelvis that supports bipedal motion in humans. Two key pieces of evidence are the wider pelvis and the angled femur. A wider pelvis in bipedal hominins supports the organs and allows for the birth of larger-brained infants. Moreover, an angled femur, known as the valgus angle, is crucial as it brings the knees and feet under the pelvis, allowing for a more efficient bipedal locomotion, as seen in modern humans.

Another significant find, discovered by Mary Leakey, are the Laetoli footprints, which provide direct evidence of early hominins walking upright around 3.5 million years ago. These footprints show a modern striding gait, confirming the adaption of bipedalism. Bipedal locomotion has many advantages, such as the ability to cover long distances efficiently and free up the hands for tool use