Skeleton - Animal Kingdom
You all know that the skeleton forms the framework of the body of different organisms in the animal kingdom. Besides giving shape to the animal, it also gives protection and support and serves as a point of attachment for the muscles. Not only the vertebrates, but many invertebrates also have skeleton in different forms. If the skeletal structures are present embedded within the body of the animals, they form the endoskeleton and if such structures are present on the surface of the animal body and are visible externally, they constitute the exoskeleton. Both these are rigid skeletons. However, some invertebrate animals use their body fluids as internal hydrostatic skeleton.