File:Left_femur_of_extinct_elephant,_Alaska,_Ice_Age_Wellcome_L0057714.jpg · Wikimedia Commons · See Wikimedia Commons
Also known as bones, bone organ, bone and bones
A bone is a rigid organ that constitutes part of the skeleton in most vertebrate animals. Bones protect the organs of the body, produce red and white blood cells, store minerals, help regulate acid-base homeostasis, provide structure and support for the body, and enable mobility and hearing. Bones come in a variety of shapes and sizes and have complex internal and external structures.