The bones form the skeleton of the body., The skeleton is made up of bones., Animals with a backbone are called vertebrates., Vertebrates are animals that have a backbone., The skeleton includes the bones of the head, trunk, and limbs., The bones of the head, trunk, and limbs make up the skeleton., The skull contains the brain., The brain is located inside the skull., The ribs join the backbone behind and the breastbone in front., The ribs are connected to the backbone at the back and to the breastbone at the front., The ribs form a strong cage called the chest., The chest is a strong protective structure formed by the ribs., The shoulder consists of the collar-bone and the shoulder-blade., The collar-bone and the shoulder-blade together form the shoulder., Naturalists divide animals into vertebrates and invertebrates., Animals are classified into vertebrates and invertebrates., The thumb has two bones, but the other fingers have three., Unlike the other fingers, which consist of three bones, the thumb consists of only two., The vertebral column forms the main support of the body., The body is mainly supported by the vertebral column..

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