Which is the modified forelimbs in birds ?

The cells responsible for bone formation are

How many ribs are present in human body ?

Which is the locomotory organ of fish ?

Muscles are attached to bones by

Synovial fluid is secreted by

The largest bone in human body is

The outer strong layer which covers the bone is called

The first seven pairs of ribs which are attached to the sternum are called as

'S' shaped movement in snake is known as