Final answer:
Orrorin tugenensis could be classified as a hominin due to anatomical traits that suggest bipedalism, such as a large femoral head and teeth similar to those of modern humans.
Step-by-step explanation:
Orrorin tugenensis could be classified as a hominin based on several anatomical traits that suggest bipedalism. For example, the large femoral head and the muscles attached to the femur indicate bipedal movement. Additionally, the teeth of Orrorin show similarities to those of modern humans. These features suggest that Orrorin tugenensis could be part of the human family tree.