Answer :

Ardipithecus was the first species in which bipedalism first arrived  and they lived in open savanna environment.

What is the evolution of bipedalism?

Bipedalism is the ability to stand and walk completely on two feet. The bipedal gait evolved 4 million years ago and is characteristic of modern humans. Efficient locomotion and empty and free hands are the main advantages of bipedalism.

Ardipithecus, the earliest known genus of the zoological family Hominidae (the group that includes humans and excludes the great apes) and the probable ancestor of Australopithecus, a closely related group often thought to be the ancestors of modern humans. Ardipithecus lived 5.8 to 4.4 million years ago, from the late Miocene. These were the first ones to develop bipedalism while continuing living in the open savannas.

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