The earliest hominid fossil, “Lucy,” is estimated to be 3.2 million years old. This early human-like species shares an important characteristic with modern humans: bipedalism. Which of the following would favor the selection of bipedal posture over walking on all fours?

Bipedal posture allowed for greater mobility in the tree canopy.

Bipedal posture allowed arms to be free to develop and use tools.

Bipedal posture allowed for an increase in hominid brain and jaw size.

Bipedal posture allowed a greater number of offspring to be produced in hominids.

Bipedal stance was selected instead of four-legged stance because the biped stance allowed the arms to be free to develop and use tools.

Bipedalism

Bipedalism was one of the first adaptations presented by hominids, and there are some hypotheses as to how the human lineage developed it. One of them says that bipedalism was developed after a group of our ancestors began to inhabit Savannah environments (open areas covered with grasses). While some lineages remained in the forests, where they could use the treetops and branches for shelter and to find food, the Savannah lineages didn't have many trees to climb, so the upright position made it easier to spot predators in the distance.

The other hypothesis relates the development of human bipedalism to the use of tools. Since a species does not move on all four limbs, the two forelimbs are free to explore the environment, assisting in the use of tools and even collecting food while moving.

With this information, we can say that bipedalism helped the human race to have a free arm to develop technologies, spend less energy when walking and other factors.

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