Answer:
I believe the answer is a single bacteria cell.
The clavicle or the collar bones are the only long bones in the body that lie horizontally. Calling the clavicle as the beauty bone is basedon the reason that it helps frame the face and round out the imperfection of your jaw line.
The answer is Phototropism, this is because the tip of the plant moves towards the light and the auxins make the plant elongate on the side with no light.