Choose the word that is different from the others in the following and give reason.

a. Clavicle b. Skull c. Femur d. Ball and socket

Ball & socket

Reason: Clavicle, skull and femur are the types of bones present at different parts of the body.

Clavicle, also referred to as collarbone is present between sternum & scapula.

Skull is a bony structure that forms the basis of our face structure & protects the brain from any damage.

Femur is the longest bone in our body which is also known as thighbone. The head of the femur fits into the hip socket & the bottom part connects to the knee.

Ball & socket is a type of joint in which the end of one bone consists a ball like structure which fits into another bone which has a socket like structure. Hip joint and knee joint are the types of ball & socket joint.