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What are the physical changes that resul...

What are the physical changes that resulted in the upright posture in the course of evolution of human?

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(i) Developed stronger and straighter legs with feet suited more for walking.
(ii) They started using their hands for grasping and for various purposes.
(iii) The pelvic girdle changed into a broad basin like structure to support the trunk.
(iv) Changes in the pelvic girdle and associated muscles.
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