Acomparision between the spine of a human and that of a great ape shows that a human spine
a. has three distinct curves - two backward and one forward - for balance
b. should have two distinct curves to keep the weight centered above the pelvis
c. is "c" shaped as a result of one backward curve in order to keep the trunk over the legs
d. is straight in order to facilitate upright posture

B

Explanation:

The spine of a human is S shaped as opposed to that of a chimpanzee, that is C shaped. In humans, this shape allows for the weight of the chest to rest upon the pelvis. Conversely, the C shaped spine of apes allows for the weight to be forward which is better for four-legged locomotion.

i believe you meant to say air rather than hair so the answer is below ")

the dead sea, the lowest place on earth at 430 metres (1,410 ft) below sea level, has a correspondingly high typical atmospheric pressure of 1065 hpa.