'This bone with a ball-&-socket joint at one end is about 1/4 of your height'
the femur
BONING UP: This bone with a ball-&-socket joint at one end is about 1/4 of your height
This bone with a ball-&-socket joint at one end is about 1/4 of your height
This bone with a ball-&-socket joint at one end is about 1/4 of your height
BONING UP
the femur
BONING UP