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Sharks - Skeleton. The skeleton of the shark has evolved and adapted to suit and aid the habitat, migration, hunting habits and diet of these acclaimed carnivores. Unlike terrestrial animals, humans, and even other marine animals, sharksâ skeletons are made purely of cartilage and connective tissue, or muscle. There is no bone. This type of skeleton means that the shark is lighter, as cartilage is about half the density of bone. This is important because, unlike other fish, the shark has no swim bladder to prevent it from sinking to the bottom of the ocean.
Yes. Reef-building corals are made up of two members, an animal and a plant that lives inside of the animal.The animal portion is a relatively simple creature called a polyp, a miniature sea anemone that resemÂ­bles a flower, with a circle of tentaÂ­cles surrounding a mouth.ach polyp is like a tiny anemone (or jellyfish on its back) which secretes a calcium carbonate, or limestone skeleton on/in which it lives......that means corals are made up of calcium carbonate(which bones are made up of) which are secreted by the polyps.