List the features of the skeleton associated with upright posture and work activity?

In the course of evolution, man has received many changes that have helped him in upright posture and work. Our ridge has four bends. These curves help us release stress on our back when walking and doing work. Our limbs are elongated. The upper limbs are needed for various jobs, and the lower limbs are needed for movement. We have a non-flat foot, which also helps relieve stress on the vertebra when walking. We have well-developed thumbs on our hands, which makes it easy to complete many tasks.