Bones fitted together in the shape of a a0 give the human body structure.

The answer is skeleton.

Please correct me if I'm wrong!! :)

Skeleton

Explanation:

Human skeleton is the internal framework of the human body. It consists of around 206 bones that are well organized to provide support to the body.

Actually there are 270 bones at the time of birth but it decreases to 206 bones till we reach our adulthood.

Human skeleton is divided into axial and appendicular skeleton. the skeleton provides support, movement, storage of minerals et cetera.

the answer would be d

✿   this landform has a high elevation and a high relief

✿   this landform is a mountain