Which morphological features made man most efficient in the course of evolution?

Explanation

Increase in cranial capacity and the over all intelligence, bipedal locomotion and freeing of forelimb, perfection of thumb opposability in forearms, loss of opposability of great toe in hindlimbs, lengthening of hindlimbs and shortening of forelimbs, erect posture by developed lumbar curve and binocular vision made man most efficient in the course of evolution.