Erect Posture: The erect posture helped the man in the following ways :

i. Because of this, man is able to have bipedal mode of locomotion.

ii. The feet of man form a kind of stable platform which help him to walk erect and balance properly.

iii. The hands of man are shorter and free to handle work.

iv. The thumb of man is better developed. The thumb closes in on the other fingers of hand.

v. Man can use his hands more delicately. This type of thumb is called opposable.

vi. Man can handle even small tools and other instruments because of the position of thumbs and fingers with great dextricity.

Large Brain Size: Following are the advantages of large brain size:

i. Brain becomes more developed. Its brain ratio is more than the others as compared to body weight.

ii. Large sized brain-greater intelligence, thinking power and correlation of facts and events.

iii. Shifting of information.

iv. Capacity of reasoning developed.

v. Senses became more powerful.

vi. Reflexes became more prominent.

vii. In fact, it is the hand and the brain that made man a super animal.