Final answer:
Bipedalism is the first trait found in the evolutionary history of humans. It refers to the ability to walk upright on two legs and allowed our ancestors to free up their hands and cover long distances more efficiently.
Step-by-step explanation:
The first trait found in the evolutionary history of humans is bipedalism. Bipedalism refers to the ability to walk upright on two legs. This trait allowed our distant ancestors to free up their hands for other tasks and to cover long distances more efficiently.
One key characteristic of bipedalism is the development of arches in the feet, which help conserve energy and increase balance while walking. Other anatomical changes associated with bipedalism include longer legs and changes in spinal curvature.