AP BIOLOGY

Detailed explanation-1: -The connection between the upper thigh and hip bones was longer in early humans than in chimpanzees, and its base thicker. The hip muscles could provide support for walking. The connection between your upper leg and hip bones is long. Its base is strong and able to withstand the stresses of walking and running.

Detailed explanation-2: -But scientists have discovered that human bipedalism, or walking upright, may have originated millions of years ago as an adaptation to carrying scarce, high-quality resources.

Detailed explanation-3: -Walking upright on two legs is the trait that defines the hominid lineage: Bipedalism separated the first hominids from the rest of the four-legged apes. It took a while for anthropologists to realize this. At the turn of the 20th century, scientists thought that big brains made hominids unique.

Detailed explanation-4: -The anatomy of bipedalism Broadly speaking, our pelvis and legs are arranged so that they balance our trunks atop our bodies while moving. Since only one limb touches the ground at a time during the walking cycle, balance is especially important. Our bodies minimize swaying from side to side.